Dear Hassan
The maximum age of many species living in streams and rivers can exceed 5-6 years, whereas most species that prefer ponds and lakes live less than one and a half years and the age of other than fresh water the average life span of a snail is approximately 10 to 15 years in captivity. However, it is believed that some species can live up to 25 years this way. In the wild however, lifespan varies from species to species, but range from 2-3 in some cases to 5-7 for other kinds of land snails.
Please find attached herewith article on Snail
good luck
Prem Baboo
http://www.snail-world.com/
Dear Hassan,
It is impossible to determine the age of a snail to the naked eye: the shell does not present annual growth striations, these more or less light bands that show the number of winters that the animal lived.
The only thing we can know is whether he is young or adult, adults with "lip" at the opening of the shell. To know the exact age of a snail, biologists have a choice of two laboratory techniques. The first is the use of "growth charts" that provide individuals of a species depending on its size by measuring the mollusk thus has an idea of his age ... minimum. Because it is enough that its growth was slowed for the estimate is wrong! The second method is more accurate, but heavier and more expensive. It consists in measuring the amounts of both forms of the oxygen atom, the isotope 16O and 18O. These values vary with the outside temperature, it can be concluded the number of winters lived by the snail, and therefore its exact age.
With my best regards
Prof. Bachir ACHOUR
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