Breeding of the snails

Breeding African Giant Snails requires a lot of you, but you get a lot in return and it's hugely educational for those interested. Whether you are planning to take a single litter or start a large breeding operation, the information on this page is meant for you!

Basic understanding of the genetics of snails

Understanding the genetics of African giant snails is not only very interesting, but also provides insights into their biology, ecology and potential effects on the ecosystems where they are introduced.

Like all organisms, African giant snails have DNA that encodes their genetic information. Their genome consists of chromosomes that carry genes responsible for various traits. The typical diploid number of chromosomes in Achatina fulica is 30 (2n=30). Each chromosome contains many genes that dictate physical characteristics such as shell size, color, and reproductive characteristics.

African giant snails are hermaphroditic, meaning that each individual has both male and female reproductive organs. This unique reproductive strategy allows them to mate with any other individual they encounter, enhancing genetic diversity within populations. During mating, snails exchange sperm, which can lead to cross-fertilization. The fertilized eggs develop into young snails that inherit a combination of genetic material from both parents.

How reproduction takes place

Reproduction often begins with a ritual in which snails perform a series of movements to attract each other. They can use their sensitive tentacles to explore each other's bodies and secrete pheromones, chemical signals that attract potential mates. This part of the process can take several hours and often involves circular movements and body contact.

Once the snails have chosen each other, they enter a mating position where they lie side by side or sometimes overlap. During the mating itself, their genitals are united, which is called "penis". Each snail will transfer sperm to the other through a special organ called a "spermatophore". The organ can be likened to an arrow shot into the other individual's throat. After a snail reaches sexual maturity, the arrow can be seen as a bulge in the snails neck. The process of sperm transfer can last for several hours.

After the sperm exchange, each snail stores the sperm in a special part of its body until they are ready to fertilize their eggs. It is important to note that snails can store sperm for a long time, which gives them flexibility in timing of egg laying.

Egg laying and hatching 

When the snail is ready to lay eggs, it burrows into the ground or seeks a moist place to create a sheltered nest for its eggs. African giant land snails generally lay between 100 and 400 eggs at a time, depending on age and health. The eggs are small and white or translucent and are placed in clusters.

Under the right temperature and conditions, the eggs hatch within a couple of days, but they can also lie dormant for a long time to hatch months later when conditions are better. It can therefore be difficult to know whether older eggs will hatch or not, so to know you can think that dear eggs start to become discolored, they are probably "expired". It is also not uncommon for the eggs to be eaten by the snails as they contain a lot of calcium, so if you want to multiply, they should be carefully moved to a more secluded place.

First time in life
 

After the tiny snails hatch, the most sensitive period for survival of their entire life begins. The parents do not have the maternal feelings that some mammals exhibit, but the young are left to fend for themselves to the best of their abilities. Since they are oviparous, they do not give birth either, but start looking for solid food immediately. As newborns, they have a thin transparent membrane as a shell and this is extremely fragile. It is important to have a good supply of lime from the first day so that they can build up their shells as quickly as possible. The recommendation is to separate all adults from the babies to avoid cannibalism. Otherwise, it is not unusual for large snails to eat the small ones to get extra calcium. When at the age of a few months you see that the shell has become colored and lost its transparency, the most critical time is over and the snail is on its way to adulthood, which begins around the age of 1. If you let all the snails be together after six months of age, you should be prepared for more litters as they are bisexual and can mate with any individual. If you do not want more reproduction, it is time to divide them before sexual maturity begins.

Runts

In litters with snail eggs, so-called runts are very common. Runts are snails that are born with deformities in the shell that can be more or less serious. From the time the shell begins to develop, you must keep an eye out for deviations in any individual in the shell structure. There are cases where mild runts can live a good life despite a slight deviation, but the more severe the deformity, the greater the risk that the organs are affected, which means that the baby snail should be euthanized as soon as possible to avoid suffering. If you choose to let the runts live on as they don't seem to be suffering, you should keep in mind that the lifespan will probably be a little shorter than expected. To know whether the shell is deviant or not, you can compare with maps of how the shell should look at different ages or alternatively compare with known healthy individuals.

Research in the field

Today we know relatively little about breeding and genetics in the fantastic world of snails, but as interest in these animals grows, so does the amount of studies that together provide a good picture of the genetic variation of these animals. Genetic variation among populations of African giant land snails is influenced by several factors including environmental conditions, geographic distribution and selective pressure. For example, populations in different habitats may exhibit variations in shell morphology or coloration as adaptations to local conditions (e.g. camouflage against predators).  

To study the genetics of African giant land snails, researchers use various molecular techniques such as DNA sequencing and molecular markers (eg microsatellites). These methods allow researchers to analyze genetic diversity within and between populations. For example, mitochondrial DNA analysis has been used to investigate phylogenetic relationships between different populations of Achatina fulica revealing insights into their evolutionary history.