Snail farming - European Commission

Interessante vídeo sobre a criação de caracóis a nível europeu e a sua expansão e possibilidades de crescimento. 

Clique na imagem

Criação de caracóis na Austrália - SNAIL FARMING IN AUSTRALIA

Escargot Caviar

If you think gathering sturgeon caviar is hard, consider this: scientists say that when snails make love, it can take anywhere from seven hours to a few years to complete the act, after which the snails lay only about 100 eggs in the dirt.

That’s a lot of love that goes into those eggs, and for a few enterprising, daring chefs, those eggs are an earthy, woodsy garnish for blinis, salads, or soups. For Chef Matthew Dolan of San Francisco’s Twenty-Five Lusk, the tiny white pearls have become an obsession that he took back with him from Finland.

“I heard about them in Helsinki, where there’s a very deep fish egg culture, but I didn’t try them,” Dolan says. At least initially, he was understandably turned off by the idea of eating snail eggs. But thanks to a stubborn purveyor who kept foisting tins of the unusual ovaries on him, Dolan relented. “I had the idea that it would be the slimiest, nastiest thing out there,” he says. “But I was wrong. It tasted like the forest floor. The flavors were more like aromas. It was like a pine forest on a warm summer day.”

His initial distaste has quickly molted into obsession, and a need to find the perfect flavor combination for the pearly white caviar, which resemble cooked Israeli couscous but have a firmer texture. “After I tasted the caviar, I couldn’t stop talking about it. I ended up eating half the tin. My wife was like, ‘if I hear about escargot caviar one more time…’”

Dolan might be abundant in his praise, but escargot caviar actually has an understated elegance. It’s almost like a flavor Rorschach test: the caviar tastes different to everybody. For some, the eggs bring out hints of pine, mushroom, and rosemary. For Dolan’s sommelier, they tasted a bit like grape leaves (“maybe the snails were snacking on them that day? I dunno,” he says). Some, like Kelly Stern, owner of Beverly Hills Caviar, say they taste like non-spicy onions. One thing has been almost universal, though: diners at Twenty-Five Luskhave almost all taken to snail caviar with wide-eyed pleasure. “They all go in expecting one thing, something very assertive, and then they’re amazed that it’s so mild and pleasant,” Dolan says. “It’s like a surprise and a relief at the same time.”

PURVEYOR STARTS THE SLOW(ER) FOOD MOVEMENT

Snail caviar is a rare product in Europe, and rarer still in the United States—mostly because for years the eggs were thought bland and tasteless. But several years ago a former French chef-turned-snail-harvester decided to change up the cultivation process, which has now led to a tiny but burgeoning snail caviar industry and a growing appetite for the eggs.

Many credit the growing popularity to Dominique Pierru, who in 2004 claims he and his wife “wanted to have a more stable, sedentary profession and snail breeding was the perfect answer.” Pierru claims to have removed the pasteurization process, which had previously dulled the caviar’s earthy flavors, instead simply quick-blanching the eggs in a hot bouillon and then curing them in sea salt, starch, citric acid, and rosemary.

Because of the labor involved—each snail lays only 100 eggs a year—a 30-gram tin of snail caviar can run upwards of $100, more than most domestic sturgeon roe (but not as much as the best Osetra caviar, which still reigns supreme).

Some chefs have run across the caviar by accident, and may start including the item in dishes. Former Chez TJ Chef Joey Elantario says he ran across dollops of snail caviar in the Palo Alto, California, restaurant’s garden, but harvesting enough of the eggs for a dish would be near-impossible. “They were great, though. We [the kitchen staff] snacked on them,” he says.

NOT IN THE CHAMPAGNE ROOM

One mistake some chefs might make is treating snail caviar like its fishy cousin. “We see it as a very fine way to serve something that tastes faintly like vegetables,” says Stern, whose company has sold snail eggs for five years and is now offering tins of it at new caviar vending machines. “You have to eat something else to understand its flavor. On its own it’s not impressive, but in contrast it shows off its flavor.”

Even the time-tested caviar combo of blinis, crème fraîche, and Champagne becomes tricky with snail eggs, which are far less assertive and taste much earthier than sturgeon. “You need to get away from blini and crème fraîche,” Dolan says.

StarChefs.com tasted Dolan’s second attempt at flavor pairing snail caviar, an ahi tuna appetizer with vanilla powder and avocado mousse. The caviar gave a nice balance to the fish and served almost as a truffle addition—gilding the lily with a bit of luxury beyond the reach of most mortals.

What do Land Snails Eat?

What do Land Snails Eat?

Snails tend to feed on a variety of items found in their natural habitat. What they will actually consume depends on where they live and the species of snail that they are. Some common items for their diet include plants, fruits, vegetables, and algae. Plants that are decaying are often a good meal for them. Seeking for calcium to get a thicker shell, snails usually will eat the dirt.

Most snail species are herbivores, which means they have only a plant diet, but some species are carnivores or omnivores. You will likely find snails around your garden as this offers them plenty of fresh plants and leaves to eat. If you use herbicides or pesticides on your plants you may be causing the death of many snails without even realizing it.

Snails as pests

Large numbers of snails though in a garden or even where farmers are growing crops can quickly become a serious problem. They will consume enough of what it growing to ruin the hard work that has been put into the area. If you are talking about a location where someone is growing food to eat or to sell then their livelihood is also being compromised. This is why people do all they can to prevent snails from consuming the agricultural crops that they are growing.

To be more humane, many that have gardens or farms strive to trap the snails that are in the vicinity rather than killing them. They either release them back into new environments or they will sell them as a source of food. Some of the easiest ways to trap them is to place lids from jars with beer in them in the garden.

For farmers that have too much land to do this, they have come up with another way to prevent damage to their crops. This involves placing 6 inch screens of copper that is placed in the ground. The slime from the snails doesn’t seem to mix very well with the copper and that means they will stay away from the foods that are growing. This process has been very successful.

Snails have to feed on foods that include large amounts of calcium. This is necessary to keep their shell hard and protective like it should be. When looking for food they use their powerful sense of smell to find their food. Snails can breathe through their skin and through an opening called the pneumostome visible on the right side of their bodies. (1) Snails have very poor vision so they can’t see what may be very close to them, but that is compensated with an excellent sense of smell.

Snails are nocturnal so they will be looking for sources of food during the night or during the very early morning hours. (2) They will consume more food at the colder months ahead come. This is so they can store up fat reserves to live on while some they hibernate during the winter.

When food sources are very low in the summer or spring months, they may voluntarily put their body into a state of hibernation as well. This allows them to conserve energy and not need to forage for additional food. This is a mechanism that allows them to be able to survive in difficult conditions of drought. (3)

They have a tongue that is very rough and the technical term for it is radula. They have rows of very small teeth that they use to scrap against the foods they want to consume. When you have snails as pets you want to pay close attention to their diet. If you feed them anything containing salt or sugar they will die.

They are often said to be very noisy eaters. However, the sounds you hear aren’t them consuming the food. Instead it is a part of the body called the radula which is tearing on what has been swallowed so it can find its way to the digestive tract.

(1)    http://www.pbs.org/kcet/shapeoflife/resources/snail.html

(2)    http://pss.uvm.edu/ppp/pubs/el14.htm

(3)    http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7427.html

All about snails - 15

Land Snails in Popular Culture

The main contribution of snails to the culture of several civilizations, has been their inclusion in their food.

Land snails don’t seem to have a good stigma to them in many cultures due to the fact that they are slow. Most people associate that nature with being lazy and not good for much. The fact that the snail isn’t a lovely animal either means that it gets overlooked when it comes to art and other types of cultural remnants.

Snails are more intelligent though than many people realize. There are stories that depict them as being very strong and self reliant. Those are traits that most people would love to have. The moral of such stories is to explain even though the snail is slow it has a purpose just like every other creature out there. Yet the fact that they aren’t mystical or beautiful has lead to more stories and cultures viewing them as something bad or evil.

In fact, with many early cultures the movements of the snail were viewed as being unclean and they often even marked people with it as a sign of punishment. Yet you will find some great early writings about the snails. For example the Greeks believed that when the snails could be seen climbing the stalks it was time for the harvest to begin. This was a signal to them that it was time to reap the rewards of the foods the gods had allowed them to grow and to live from.

The Aztec believed that the snail was the moon god and that the shell was his protection. They also felt that the appearing of the snail at times and then not at others had to do with the meaning of the rebirth of the moon. Of course we now know that this has to do with them being nocturnal and searching for food at night instead of during the daylight hours.

Most of us are familiar with the works of psychologist Carl Jung. He often talked about interpreting thoughts and dreams. The analogy he refers to with snails is that the shell is the conscious thought process and then the soft part of a snail is the unconscious thought process. Not everyone buys this theory though but the analogy is one that many continue to use today.

There are quite a few references in our language today that refer to snails, but they aren’t in good light. They are meant to mean a very slow process. For example saying someone moves as the pace of a snail or that they are as slow as a snail. The other is called snail mail which refers to mailing something through the post office. We get used to e-mail which allows us instant access so we then become impatient with what takes longer to receive.

Sometimes you will notice snails in books or movies with characteristics that are quite charming. The Disney productions are great at doing this and the charm they put into them helps people to enjoy these animals more. However, they still don’t seem to get the attention or the accreditation in society as so many others.

I mean, when was the last time you saw a business using a snail as their logo? They want to give an image that people relate to in a positive manner. Unfortunately the snail just doesn’t happen to be one of them that fit into that category.  If you can come up with some creative ideas though you may be the one that is able to help change some of the mindsets that people have relating to snails in culture.

All about snails - 14

Snail Facts for Kids

 Snails are so diverse that there are land snails, sea snails and freshwater snails.

 There are thousands of species of snails.

 The “giant tiger land snail” also known, as “giant Ghana snail” is the largest land snail in the world, their length can reach up to 12 inches.

 Land snails secrete mucus to facilitate locomotion and reduce the friction against the ground.

 Snails try to get a diet that is full of calcium to keep their shells thick and healthy.

 Land snails have microscopic teeth! They are contained in a structure called the radula and that is composed of rows of them.

 The “cone snails” a family of sea snails is venomous and some of them are fatal to humans!

 There are around 600 different species in the family of “cone snails”.

 There are around 30 humans killed by cone snails, that have been registered.

 The sea snails breathe with gills, the land snails breathe with lungs while some species of freshwater snails breathe with lungs and others with gills.

 Several species of land snails are used in the cuisine of several countries and they are considered a delicacy.

All about snails - 13

Snail Habitat

Snails are quite plentiful in the world so it shouldn’t come as a surprise to learn they are found in very diverse habitats. Some of them are comfortable in the desert while others live in ditches and cooler climates. These include the mountain areas and even in marshes. What is often found is that land snails live in locations where there are humans around. If you have a garden then chances are you have already seen them exploring this area as well.

What you will discover is that snails species are quite abundant with thousands of them out there. Not all of them are land animals though but a large number of them are. Snails are often where you can see them if you are looking for but most of us are just too busy with our daily routine to notice them.

They don’t like to be where it is too hot but they often find plenty of solace in the shaded areas. They may live in locations where the overall temperature is hot but then just not be out much. This is why you will have to look for snails when it is cloudy or when it is nighttime. They enjoy humid locations though more than where there is just dry heat.

Some people assume that you won’t find snails living in the desert but that isn’t true. In fact there is plenty of evidence to show they thrive there just fine. They do tend to spend a great deal of their time inside of the shell though instead of outside of it. While they conditions may not be ideal, they know how to make the most of it so that they can find food and survive the heat.

Other types of land snails though live underground so you will only see them out there when it is raining and they have to come to the surface so that they don’t drown. They only live less than one inch below the surface though so it is easy enough for them to come out when the rain starts. They are able to easily move as they need to though to get through the changing weather conditions. Even though they are very slow animals by nature, they are very instinctive when it comes to their habitat and survival skills.

Snails don’t reside in just one location all the time. They tend to make their home anywhere since they carry it on their back. They don’t like extreme heat so they will find places where they can be cool. They also need to find adequate supplies of food. Of course a snail can’t move very far in a day but they do continually move most of the time to new locations.

Snails are loners but they often come into contact with each other due to the feeding grounds where they find plenty for all of them to share. This is also where they find each other for mating to occur. They aren’t aggressive in nature towards each other. Then tend to live their own existence without bothering each other.

If you take some time to observe the environment around your home, chances are you will find signs that snails live there. Most of the time they aren’t anything to really worry about. If you are planning to start a garden though they may become more of a pest at that point. You can explore options though to trap them so they don’t feed from what you have planted. It can also be fun just to identify what types of snails live in your area.

All about snails - 12

What do Land Snails Eat?

Snails tend to feed on a variety of items found in their natural habitat. What they will actually consume depends on where they live and the species of snail that they are. Some common items for their diet include plants, fruits, vegetables, and algae. Plants that are decaying are often a good meal for them. Seeking for calcium to get a thicker shell, snails usually will eat the dirt.

Most snail species are herbivores, which means they have only a plant diet, but some species are carnivores or omnivores. You will likely find snails around your garden as this offers them plenty of fresh plants and leaves to eat. If you use herbicides or pesticides on your plants you may be causing the death of many snails without even realizing it.

Snails as pests

Large numbers of snails though in a garden or even where farmers are growing crops can quickly become a serious problem. They will consume enough of what it growing to ruin the hard work that has been put into the area. If you are talking about a location where someone is growing food to eat or to sell then their livelihood is also being compromised. This is why people do all they can to prevent snails from consuming the agricultural crops that they are growing.

To be more humane, many that have gardens or farms strive to trap the snails that are in the vicinity rather than killing them. They either release them back into new environments or they will sell them as a source of food. Some of the easiest ways to trap them is to place lids from jars with beer in them in the garden.

For farmers that have too much land to do this, they have come up with another way to prevent damage to their crops. This involves placing 6 inch screens of copper that is placed in the ground. The slime from the snails doesn’t seem to mix very well with the copper and that means they will stay away from the foods that are growing. This process has been very successful.

Snails have to feed on foods that include large amounts of calcium. This is necessary to keep their shell hard and protective like it should be. When looking for food they use their powerful sense of smell to find their food. Snails can breathe through their skin and through an opening called the pneumostome visible on the right side of their bodies. (1) Snails have very poor vision so they can’t see what may be very close to them, but that is compensated with an excellent sense of smell.

Snails are nocturnal so they will be looking for sources of food during the night or during the very early morning hours. (2) They will consume more food at the colder months ahead come. This is so they can store up fat reserves to live on while some they hibernate during the winter.

When food sources are very low in the summer or spring months, they may voluntarily put their body into a state of hibernation as well. This allows them to conserve energy and not need to forage for additional food. This is a mechanism that allows them to be able to survive in difficult conditions of drought. (3)

They have a tongue that is very rough and the technical term for it is radula. They have rows of very small teeth that they use to scrap against the foods they want to consume. When you have snails as pets you want to pay close attention to their diet. If you feed them anything containing salt or sugar they will die.

They are often said to be very noisy eaters. However, the sounds you hear aren’t them consuming the food. Instead it is a part of the body called the radula which is tearing on what has been swallowed so it can find its way to the digestive tract.

(1)    http://www.pbs.org/kcet/shapeoflife/resources/snail.html

(2)    http://pss.uvm.edu/ppp/pubs/el14.htm

(3)    http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7427.html

All about snails - 11

Land Snails in Popular Culture

The main contribution of snails to the culture of several civilizations, has been their inclusion in their food.

Land snails don’t seem to have a good stigma to them in many cultures due to the fact that they are slow. Most people associate that nature with being lazy and not good for much. The fact that the snail isn’t a lovely animal either means that it gets overlooked when it comes to art and other types of cultural remnants.

Snails are more intelligent though than many people realize. There are stories that depict them as being very strong and self reliant. Those are traits that most people would love to have. The moral of such stories is to explain even though the snail is slow it has a purpose just like every other creature out there. Yet the fact that they aren’t mystical or beautiful has lead to more stories and cultures viewing them as something bad or evil.

In fact, with many early cultures the movements of the snail were viewed as being unclean and they often even marked people with it as a sign of punishment. Yet you will find some great early writings about the snails. For example the Greeks believed that when the snails could be seen climbing the stalks it was time for the harvest to begin. This was a signal to them that it was time to reap the rewards of the foods the gods had allowed them to grow and to live from.

The Aztec believed that the snail was the moon god and that the shell was his protection. They also felt that the appearing of the snail at times and then not at others had to do with the meaning of the rebirth of the moon. Of course we now know that this has to do with them being nocturnal and searching for food at night instead of during the daylight hours.

Most of us are familiar with the works of psychologist Carl Jung. He often talked about interpreting thoughts and dreams. The analogy he refers to with snails is that the shell is the conscious thought process and then the soft part of a snail is the unconscious thought process. Not everyone buys this theory though but the analogy is one that many continue to use today.

There are quite a few references in our language today that refer to snails, but they aren’t in good light. They are meant to mean a very slow process. For example saying someone moves as the pace of a snail or that they are as slow as a snail. The other is called snail mail which refers to mailing something through the post office. We get used to e-mail which allows us instant access so we then become impatient with what takes longer to receive.

Sometimes you will notice snails in books or movies with characteristics that are quite charming. The Disney productions are great at doing this and the charm they put into them helps people to enjoy these animals more. However, they still don’t seem to get the attention or the accreditation in society as so many others.

I mean, when was the last time you saw a business using a snail as their logo? They want to give an image that people relate to in a positive manner. Unfortunately the snail just doesn’t happen to be one of them that fit into that category.  If you can come up with some creative ideas though you may be the one that is able to help change some of the mindsets that people have relating to snails in culture.

All about snails - 10

Land Snails as Food, Escargots

Since prehistoric times, man all over the world consumed what they could for survival, and that sometimes included snails. In several parts of the ancient world including the Roman Empire, snails were eaten frequently. In fact, they were harvested so that there would be a huge supply of them all the time to meet the demand.

That desire to consume them hasn’t stopped there. They continue to be a huge industry for the restaurant business. Offering snails is getting usual for unusual receptions and other elaborate affairs. If you haven’t tried them, the idea may not be very appealing to you. However, you may find that your taste buds are really impressed by them.

Land snails are regularly consumed in the European cuisine. It is no secret that many people find snails to be delicious as an appetizer or as a main course. There are plenty of well known recipes out there for making them and many people do so at home. Such dishes are common in many types of fine restaurants as well.

For example in France they are very popular and they are called with the French word “Escargot”. When cooked, snails are prepared with garlic and parsley butter, added for seasoning and they are server in their own shell. They are very expensive due to the fact that they are considered a delicacy.

In Greece and Italy they are often consumed in a diversity of dishes and sometimes they are even used in sauces and poured over various types of pasta. Other countries like Spain, Portugal and Germany also consume them, where people create a variety of dishes. In the US there is huge market for Escargots where they are imported from many countries. Many of the recipes found in some restaurants are spin offs from what is cooked in the European countries.

Escargot is the common name for snails when they are to be eaten in a dish. Millions of pounds of snails are consumed around the world annually. In fact, there is even a day to celebrate it! May 24th is the National Escargot Day. Recipes like the ones below are cooked that day:

    Escargots Gratin

    Escargots in Herbed Cream

    Escargot a la Bourguignonne

    Saffron Tagliarini With Snails & Sorrel

    Mushroom & Escargot Soup

   Burgundian Escargots With Spaghetti
It is believed that snails for eating were brought to the United States (California) in the 1850’s. Either by immigrants or by consumers, but some of them escaped though and it didn’t take long for them to be all over the country.

Many people viewed them as pests which is why they don’t have any problems eating them. Instead of paying money for them, they started to harvest their own from gardens and farms. In fact, some of the farmers in California were making a nice amount of money on the side by collecting the snails and selling them on the market along with their fruits and vegetables. However, wild snails can carry deadly diseases, therefore regulations in the U.S. to sell and harvest them where established to avoid improper handling.

The most common type of snail used is the garden variety. However, if you have a garden and they are present do not try to trap them and process them yourself. This would be a great way to take care of the problem you are having with the pests harming your fruits and vegetables, but as we mentioned above, wild snails can carry a parasite that can cause meningitis.

As a note of caution it is important to mention that you need to properly cook snails before you consume them, even if they are purchased. The failure to do so can result in parasites entering the body, which have been linked to the development of meningitis. The failure to cook them properly can result in people becoming very ill. When you buy snails to cook you need to prepared them well done, so if present the parasite would be killed.

Before cooking snails, chefs put them on fasting for three days only with water and then feed them with flour and water for one week to purify them. After that, they are cooked with one of the recipes mentioned before.

All about snails - 9

Roman Snail – Helix pomatia

Description

The helix pomatia is very famous because it is the snail used in the exclusive French cuisine where is called “Escargot”. This species of snail is also known as Roman Snail, Burgundy snail or Apple snail.

As we can infer, this snail is edible and highly valued. It has been farmed and it has created an industry to supply restaurants around the world.

The Roman snail is classified as a terrestrial gastropod mollusk.

Anatomy

The Helix pomatia is an air breathing land snail that has a creamy to light brown shell with darker brown bands. The shell is almost rounded with a width of 1.2-2 inches and a height of 1.2-1.8 inches.

They have a single lung and a muscular foot that helps with locomotion. The foot contracts to produce movement and glands within it release a mucus that reduce friction with the underneath surface, reducing risks of damaging their skin.

Another important anatomy characteristic is a couple of tentacles in the head. The upper pair is used for vision, while the lower contains smell sensors.

Roman snail in garden.

Behavior

The trail followed by the Roman snail can be easily followed because they leave behind a mark of slime, which actually is the mucus produced by the foot to ease the movement.

When a helix pomatia moves above dry surfaces, they tend to reduce the foot contact with the surface to avoid the loose of water.

Burgundy snails usually are active during night time, but they can be out on a rainy day or in early mornings, especially if it is a cloudy day.

Habitat and Distribution

This gastropod mollusk also known as apple snail is native of Europe including countries like Austria, Belgium, Germany, Romania, Sweden, Spain, Ukraine, United Kingdom, Luxembourg and most territories in the continent.

However has been moved by humans to Asia, Africa, Oceania and the Americas, where there is a huge industry of snail farming of this and some other edible species.

The helix pomatia habitat usually will be below 2,000 meters above the sea level in places with mild temperature and high humidity. They won’t be find in places with a lot of sun as they cannot tolerate direct sunlight or heavy rains

Roman snail or escargot

Diet and Feeding Habits

Usually the feeding activity of a Roman snail will be during the night, but you can find them during early morning hours or during rainy days. To scrap their food, the helix pomatia will use an organ inside its mouth with micro teeth called the radula.

These snails feed on a variety of plants, vegetables, flowers and leaves. However, they need to consume a considerable amount of calcium to preserve their shells as hard as possible and when they are not able to get it from their food, they will feed on some other materials which contain calcium, even soil or rocks.

Reproduction

This snail, as most land gastropods is hermaphrodite; this means that they have both reproductive organs. However, they need to mate with other snails to fertilize their eggs.  During the mating process, both snails will fertilize each other making them both able to release eggs.

The mating process can last for several hours. During that time, both will exchange “love darts”, a calcareus structure that is injected to each other.

Two to eight weeks after mating, they will lay 30 to 50 eggs in holes dug out in the ground with their foot. After 3 to 4 weeks of this, newborn snails will hatch their eggs and will appear out from the soil.

It is believed that this process can be repeated from 2 to 6 times in a year, depending on the climate conditions.

Predators

Roman snails main predators are insects, toads, centipedes, ground beetles, mice and birds, being the eggs the most attacked.

One of the major threats their have, is the continuous habitat destruction. However, they are pretty good surviving and are least concern regarding conservation.

http://en.wikipedia.org/wiki/Helix_pomatia

http://animaldiversity.ummz.umich.edu/accounts/Helix_pomatia/

http://www.iucnredlist.org/details/156519/0

All about snails - 8

Garden Snail – Helix aspersa

Description

The garden snail (helix aspersa) is one of the best-known species of snails in the world. As all terrestrial snails is a gastropod mollusk. It is so common, that it is one of the most proliferated terrestrial mollusks.

The helix aspersa is also known with the common name of “European Brown Garden Snail”, but its scientific name is has alternative versions. Some scientist name this snail as Cornu aspersum, Cantareus aspersus or Cryptomphalus aspersus.

This species is native of Europe but it has been introduced in several parts of the world where it has become a pest for crops and gardens.

Anatomy

The Helix aspersa is an air-breathing snail, which has a single lung. They have a brownish soft body, which is usually covered with slimy mucus.

They have yellow or cream-colored shells with brown spiral stripes. When a snail is old enough, a lip is formed at the edge of the shell aperture. The shell of this species has a height of about 1-1.4 inches and a width of 1-1.5 inches.

The garden snail has a flat muscular organ called a foot that helps it move with a gliding motion helped by the release of a mucus to reduce friction with the rough surface.

This mucus is the reason why snails leave a wet trace of slime when they move around.

Garden Snail or Helix aspersa

Behavior

Garden snails are mainly active during nights or early mornings when the sun is not shinning, however they can be active during cloudy or rainy days.

Some Helix aspersa hibernate during winter months, especially when they are mature, but they return to activity with the spring.

They are extremely slow as their fastest speed is only 1.3 centimeters per second.

Habitat and Distribution

The Helix aspersa was originally found in the British islands, western Europe and the Mediterraneo, reaching some regions of north Africa, and the middle east.

However, this snail has been introduced to several places where they have become agricultural pests. These places include the United States, Canada, South Africa, Australia, New Zealand, Mexico, Chile, Argentina and some others. This snail has arrived to these places either by accidentally hidden in plant or vegetable shipments or intentionally imported for some purpose.

Diet and Feeding Habits

Garden snails are herbivorous and feed on several kinds of fruit trees, garden plants, crop vegetables and some cereals.

Snail mouth is beneath its tentacles and it has a toothed ribbon called the radula, which is used to fragment its food. This structure is exclusive of mollusks and most of them have one.

Close up to garden snail on green background

Reproduction

Like other gastropod mollusks, the Helix aspersa is hermaphrodite; this means that it has both male and female organs. However, mating is required for fertilization, even tough self-fertilization is possible for this species.

The mating process is complex and interesting. After some pairing and courtship, this species start the mating process that can last from four to twelve hours and usually includes the exchange of a love dart, a kind of calcareous arrow with a purpose still unclear.

During the mating process they fertilize each other and they both will lay around 80 eggs 3 to 6 days after the mating occurs. To deliver his eggs, each snail will create a nest digging a hole in the soil with its foot. The nest will be 1 to 1.5 inches deep where the eggs will be delivered.

Gardens snails are able to deliver up to six batches of eggs in a single year. Each newborn, will take one to two years to mature.

Predators

Garden snails are food source for some animals like lizards, frogs and worms. Predatory insects and other species of snails will also eat garden snails.

Some birds, especially ducks will feed on these snails.

Relation with humans

This species is edible and it is sometimes used for cooking, although it should not be confused with the helix pomatia, the “Escargot”.

Although is considered a pest in most places, it has acquired popularity in the cosmetic industry because the regenerative properties of their mucus.

http://www.arkive.org/garden-snail/helix-aspersa/

http://entnemdept.ufl.edu/creatures/misc/gastro/brown_garden_snail.htm

http://www.ipm.ucdavis.edu/PMG/r107500111.html

http://en.wikipedia.org/wiki/Helix_aspersa

All about snails - 7

Giant African Land Snail – Achatina fulica

Description

The Giant African Land Snail is one of the largest of all the terrestrial species out there. It is very rare that you will come across one but if you do pay close attention to the very unique markings that they offer. They have a light to dark brown shells with vertical stripes of a darker shade of brown on them. The average adult shell has a conical shape and its length is 4 inches although exceptional individuals have reached up to inches 7 inches.

They can range in size from about 3 inches long to about 8 inches long. They have an average life span of about 5-7 years. When they have enough food and the weather is comfortable, they tend to live much longer. Some of them have been known to live up to 10 years. It is not easy to have them in captivity because people aren’t usually educated about the temperature and the moisture that they need.

The “Achatina fulica” is considered one of the most invasive species in the world and it is considered by the United States Department of Agriculture as one of the most damaging species for the agriculture and crops in the country. It is known to eat at least 500 different species of plants.

Anatomy

A very important part of the anatomy of this snail is the tongue, which is called the radula. They have small spikes on the tongue that allow it to grab food easily. They are able to sense movement because they don’t have ears. They do have a very good sense of smell though.

They have very powerful foot muscles and this is what allows them to be able to move forward. They also release a slippery substance, a kind of mucus, as they move to help them move through rough materials without damage. Their movements are very slow which is where the saying moving at a snails pace comes in. They often blend in very well to their surroundings though which helps to make up for the fact that they can’t move very fast.

The shell is the location where the Giant African Land Snail takes refuge from predators. They will also spend time inside of their shells when the temperatures begin to dip too low at night for their comfort. While this shell is very hard, it can dry out if they don’t get enough moisture. There are several layers of this shell. Each one has its own process so that the outer shell can be strong. The shell will continue to grow as the snail does for almost one year, when you can guess how big the snail will be.

Behavior

Besides the USDA, several state governments like Idaho, Georgia and Florida among others have listed this species as highly invasive and set controls to avoid their proliferation. The global invasive species database, have listed the Achatina fulica in the top 100 of their rank and associations like invasive.org have made similar warnings.

Image Courtesy: Roberta Zimmerman, USDA APHIS, Bugwood.org

The Giant African Land Snails don’t seem to interact with each other except for when they are going to mate. They don’t have any sounds and they spend their time moving, eating, and resting.

They are considered to be active between 9 C and 29 C degrees but they are able to survive above 2 C degrees by hibernating inside of the shell during the colder months. During this time, they are able to slow their bodies down enough that they don’t need to eat or to move during that period of time. They can remain inside of the shell for several months before they emerge again.

Sometimes, you will find that these snails may aestivate in the summer months as well. This is caused by drought conditions because their shell will dry out. They are able to keep it moist by creating a barrier with a thin layer of mucus that their bodies create.  In case of severe drought, they are able to aestivate up to three years.

Even so, many experts believe there has to be much more than meets the eye when it comes to these snails. Yet there hasn’t been very much in the way of research conducted on them. Many people would rather spend the time and money investigating other types of animals that seem to be more interesting to the public in general.

Habitat and Distribution

As you may have guessed by the name, The Giant African Land Snail is found in Africa. The Achatina fulica is originally native of East Africa, from Mozambique in the south to Kenia and Somalia in the north. However, they have been introduced in recent years to several locations and seem to have adapted extremely well. These areas include the Caribbean and Pacific islands. They often end up in places where they shouldn’t though due to people transporting them, either as pet trade or inadvertently.

It may surprise you to learn that it is illegal to have one of them in the United States as a pet. This is because they are considered as one of the most invasive species in the world and they have produced great damage to crops in states like Florida, Georgia or Idaho.

While you may think it is no big deal, they can deposit a very large amount of eggs, up to 200 every time they deliver a batch of eggs, and this can happen in a short span of time. Then instead of having one Giant African Land Snail you will have many munching around. Some people turn them loose to get rid of them and that is were the real trouble starts. Instead you should contact your local animal shelter and they can come pick them up.

Diet and Feeding Habits

These snails are herbivorous. They consume a wide variety of plants, fruits and vegetables. They also need calcium in order to ensure their shell stays very strong, so they will consume more of particular types of plants in order to get enough of the calcium they need. When they aren’t able to get enough calcium in their diet from plants, they may feed on bones from carcasses, sand or small stones to get it. They also consume small amounts of water that they can get from the food they consume as well.

Giant African Land Snail / Photo taken by Sonel.SA

Reproduction

The Giant African Land Snail is categorized as a hermaphrodite. This means that they possess the reproduction organs for both males and females.

While you still will need to have two of them for successful breeding, they can take on either role in the process or get them both fertilized, depending mainly on the size difference between the mating couple. They don’t have a set breeding period and on average they lay 5-6 clutches of eggs per year, containing each one close to 200 eggs per clutch with the right conditions.

Delivering close to 1,200 eggs per year and with a hatch success probability of 90%, this species can quickly become a pest.

Predators

It may surprise you to learn who the various predators are of the Giant African Land Snail. They include the caterpillar, ground beetles, other species of snails, and many types of vertebrates.

In Africa, the Giant African Land Snail is considered to be a very delicious source of food. It is nutritional in value and in many areas it is also very expensive. Many villagers will harvest these snails in order to either eat them themselves or to sell them to make money. It is important to note that this particular type of snail has been associated with different types of parasites. The failure to cook them completely can result in humans becoming very ill called meningitis.

Most humans don’t realize how delicate the protective shell of a Giant African Land Snail can be. When a person is holding one it can dry out faster. One way to prevent that is to wet your hands before picking one up to closely examine it. Failure to do so can result in the shells drying up and then these snails don’t have any way to protect their bodies.

Since they also feed on plant life, the use of pesticides is a common cause of death for the Giant African Land Snail. In most areas they are considered to be nothing more than destructive pests. They can affect the quality of foods being grown so preventing them from being in the area often takes drastic measures.