Red Spotted Nerite care guide
Red Spotted Nerite (Neritina virginea) — minimum tank 20 L, temperature 22-28 °C, pH 7.5-8.5.
Compiled by Aquairi from published sources · Published · Updated
Overview
Red Spotted Nerite (Neritina virginea) is a freshwater (or brackish) snail of the family Neritidae, listed in the Aquairi knowledge base as an intermediate-level species. Caribbean nerite with variable red, brown and black patterning on smooth shell. Originally brackish — does best with low salinity.
Taxonomy
- Family: Neritidae
- Genus: Neritina
- Scientific name: Neritina virginea
- Common synonyms: Virgin Nerite, Red Onion Snail
Habitat
Neritid snails inhabit tropical and subtropical coastal streams and estuaries worldwide, from East Africa and the Indo-Pacific to the Caribbean. Most species require brackish or marine water for larval development, although adults thrive in pure freshwater aquariums. The Aquairi knowledge base records this entry from: Caribbean.
Tank requirements
- Minimum tank volume: 20 L (5.3 US gal)
- Adult size: 1-2 cm
- Temperature: 22-28 °C (72-82 °F)
- pH: 7.5-8.5
- GH: 8-18 °dGH
- KH: 6-14 °dKH
- Salinity (specific gravity): 1.005-1.015
- Lifespan: 1-2 years
Diet
A herbivorous grazer. Diet consists almost entirely of biofilm and soft algae rasped from solid surfaces. In the aquarium no supplementary feeding is needed in a mature tank; in nutrient-poor systems, occasional blanched spinach, zucchini or algae wafers supplement intake.
Compatibility
Peaceful algae-grazing snail that does not damage live plants and ignores tank mates of any size. Suitable tank mates listed in the Aquairi knowledge base: Mollies, Bumblebee Goby. Should be kept away from: Loaches, Crayfish.
Breeding
Sexual reproduction with an obligatory salt or brackish larval phase. Females release planktonic larvae that develop only in higher-salinity water and metamorphose into the juvenile stage there before migrating back upstream. As a result, the species essentially does not reproduce in pure freshwater aquariums; eggs may be laid on hardscape, but the larvae cannot complete development.
Breeding the Virgin Nerite (Neritina virginea)
Overview
Neritina virginea, the virgin or red-spotted nerite, is a small herbivorous snail of the family Neritidae from the tropical western Atlantic, ranging through the Bahamas, Cuba, the West Indies, Central America and northern South America up to Texas and Florida. Its smooth shell shows highly variable colours and patterns. The species withstands large changes in salinity and lives in fresh, brackish and sea water, inhabiting rivers, estuaries, brackish ponds and mangrove forests.
It is diadromous and is involved in massive upstream migrations between fresh and marine environments, a life cycle that has direct consequences for breeding it in captivity.
Sexing
Nerites are not hermaphroditic and cannot change sex, so both males and females are needed for reproduction. They cannot be reliably sexed externally, so a group is kept to ensure both sexes are present.
Reproduction & Young
Females deposit hard, white egg capsules on solid surfaces such as driftwood, each capsule containing many eggs. The microscopic larvae are notoriously difficult to feed and require brackish or salt water to develop reliably; a standard freshwater aquarium lacks the salinity the larvae need. This matches the species' diadromous biology, in which early development occurs in saline downstream waters before juveniles migrate upstream.
Common Challenges
In freshwater tanks adults often lay capsules that never hatch. Successful rearing requires a dedicated brackish or marine larval phase with appropriate salinity and larval foods, followed by slow acclimation of juveniles back to freshwater, which is beyond a typical home setup. Keep adults away from snail-eaters such as loaches and crayfish.