Nerite Snail Breeding Guide

Nerite snails lay white egg capsules in freshwater, but the larvae require brackish or saltwater to develop, so they essentially do not breed in freshwater tanks.

Overview

Neritina natalensis is a popular algae-eating snail that lives and feeds in freshwater but cannot complete its life cycle there. In nature it returns to brackish or marine water to reproduce, and its larvae develop only in brackish or saltwater. For this reason, although individuals frequently lay eggs in home freshwater tanks, those eggs essentially never produce surviving young in a standard freshwater aquarium.

Sexing

Nerite snails are not hermaphroditic and cannot change sex, but they are difficult to sex visually. The practical approach is to keep a group of six or more so that both males and females are likely present.

Breeding Conditions

In freshwater the snails will lay hard, white egg capsules on surfaces such as driftwood, rock or glass; each capsule contains dozens of eggs. To progress beyond this stage a brackish or saltwater rearing setup is required, because the larvae will not hatch and develop reliably in freshwater.

Egg-laying & Larvae

The familiar white capsules that look like sesame seeds are egg cases. Depending on temperature, larvae may hatch within a few days to several weeks, but only in brackish or salt water. The newly hatched larvae are nearly microscopic and notoriously hard to feed, which is the main reason home rearing rarely succeeds.

Challenges

The combination of a brackish or saltwater requirement, microscopic planktonic larvae and demanding feeding makes successful reproduction in a freshwater home aquarium effectively unattainable. Most aquarists simply remove or ignore the harmless egg capsules, which do not hatch in freshwater.