Seminole Ramshorn (Planorbella duryi) Breeding Guide

Planorbella duryi is a hermaphroditic Florida ramshorn that breeds prolifically, laying transparent gelatinous egg masses underwater that hatch in about three weeks.

Overview

Planorbella duryi, the Seminole ramshorn, is a ramshorn snail endemic to the freshwater ecosystems of Florida and found in most freshwater habitats including streams and ponds. It is a common aquarium snail that feeds on dead or decaying plants, fish and algae, which makes it a useful cleanup grazer.

Sexing

The species is hermaphroditic, so each snail carries both male and female reproductive organs and no sexed pairing is needed. A single individual can therefore seed a population, and groups breed readily.

Egg-laying / Reproduction

These snails are very fast breeders. Eggs are spawned in a transparent gelatinous mass attached to underwater surfaces, and the clutches usually hatch in about three weeks. No air gap is required because reproduction takes place fully submerged.

Juvenile Care

Juveniles hatch directly from the gelatinous mass and begin grazing on algae and decaying organic matter without special care. They mature quickly, contributing to the species' rapid population growth.

Common Challenges

Because of its high reproductive rate, Planorbella duryi can overpopulate an aquarium. Some keepers value it as cleanup crew while others consider it a pest, so feeding should be controlled and surplus snails removed to keep numbers in check.