Why the Bumblebee Nerite Snail Won't Breed in Freshwater (Neritina juttingi)

The Bumblebee Nerite (Neritina juttingi) lays egg capsules in freshwater, but its larvae need brackish or salt water to develop, so it cannot reproduce in a freshwater aquarium.

Overview

The bumblebee nerite, Neritina juttingi, is a small Neritidae snail from the Indo-Pacific, marked with black-and-yellow striping. Its care matches other nerites: it grazes algae and needs hard, alkaline water. It also shares the amphidromous nerite life cycle that requires brackish or salt water for larval development, so it does not reproduce in a freshwater aquarium.

Sexing

Bumblebee nerites have separate sexes and are not hermaphroditic, so a single snail cannot multiply on its own. The sexes are not reliably distinguishable by eye, which is why a small group is kept to ensure both are present.

Conditioning

Adults stay healthy and lay egg capsules when given hard, alkaline water, plenty of algae and adequate minerals. As with all nerites, conditioning does not enable reproduction, because the larvae still require brackish or marine salinity to develop.

Breeding Setup

To complete the cycle, the larval stage must take place in brackish or saltwater. Keepers either acclimate adults to brackish water or move egg-bearing surfaces into a brackish or saltwater rearing tank, since the veliger larvae need that salinity and specific gravity to become juveniles.

Why It Won't Breed in Freshwater

In freshwater the female deposits hard, white egg capsules on surfaces, each holding many eggs, but no viable snails emerge. The larvae cannot develop without brackish or marine water, so the population does not grow in a freshwater tank despite the eggs being laid.

Common Challenges

The hard white egg capsules cling to surfaces and are difficult to remove, and many keepers find them unsightly. Even with a brackish rearing tank, feeding the tiny larvae is extremely difficult, so captive breeding rarely succeeds.