POND SNAIL FAQ
Everything you’ve ever wanted to know about Japanese Trapdoor Snails and the role they play in a healthy pond.
JAPANESE TRAPDOOR SNAIL
Care & FAQ
Are Snails Good for Your Pond?
Japanese Trapdoor Snails are the only type of snail that you can safely introduce to your pond. While other types of snails reproduce quickly and can clog pumps, Trapdoor Snails are slow breeders that grow too large to work their way into pond plumbing.
Why Are They Called Trapdoor Snails?
Japanese Trapdoor Snails (Viviparus malleatus) gain their name from the fingernail-like plate at the bottom of their shell. When scared, the snail can retreat into its shell and pull the plate – called an operculum – behind it, like a trapdoor.
Will Trapdoor Snails Take Over a Pond?
Nope! While some species of snail can lay 100+ eggs every few weeks, Japanese Trapdoor Snails are live-bearing and rarely give birth to more than 30 babies per year. Of these, only a few survive to adulthood. Trapdoor Snails develop in eggs inside the mother before hatching internally and emerging as fully-formed, BB-sized babies.
Will Snails Get Rid of Algae?
Algae and sludge are Trapdoor Snails’ primary food source – making them a perfect addition to your pond. For best results, add five snails for every 20 square feet of pond diameter. Planting waterlilies and other aquatic plants will help further minimize algae in the pond.
Do Trapdoor Snails Get Along with Koi and Goldfish?
Japanese Trapdoor Snails are extremely docile and get along fine with koi, goldfish and other pond residents. They are also gentle on plants, preferring soft algae over chewy lily pads.
Will Trapdoor Snails Survive Winter?
Japanese Trapdoor Snails will survive winter in most parts of the US as long as the water is deep enough (about 20 to 30 inches) and has adequate aeration. Unlike some other types of snails, Trapdoor Snails have gills that let them remain underwater all winter without needing to surface.
WANT MORE SNAIL FACTS?
(Of course you do!)
Trapdoor Snails develop inside eggs inside the mother, but these eggs never leave her body. Instead, the babies hatch internally and emerge live. This is called
Oviviviparity
A group of snails is called an
Escargotoire
Trapdoor Snails have a gestation period of up to
Nine Months
While many other types of snails are hermaphroditic, Trapdoor Snails are distinctly
Male or Female
The two sexes look almost identical, except males have one antenna that is larger than the other.
Trapdoor Snails develop inside eggs inside the mother, but these eggs never leave her body. Instead, the babies hatch internally and emerge live. This is called
Oviviviparity
A group of snails is called an
Escargotoire
Trapdoor Snails have a gestation period of up to
Nine Months
While many other types of snails are hermaphroditic, Trapdoor Snails are distinctly
Male or Female
The two sexes look almost identical, except males have one antenna that is larger than the other.
