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Care guide · Freshwater snails

Sowerby's nerite snail

Clithon sowerbianum

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Sowerby’s nerite (Clithon sowerbianum) is a small nerite reported from coastal parts of Asia. Species profiles place it in fresh-to-brackish waters, especially estuaries, lagoons and lower stream reaches. That does not make it automatically suitable for every freshwater aquarium: its life cycle and exposure to changing salinity deserve careful consideration. A reviewed aquarium profile describes it as an algae grazer and lists care values, while also warning that permanent freshwater may not meet its biology over the long term. We therefore show those values as secondary husbandry guidance, not proven physiological limits. Identification is also difficult because nerites enter the trade under varied names and shell patterns. This guide separates confirmed taxonomy from aquarium-source reports and unresolved questions. It does not invent a minimum volume, food product or generally suitable tankmate.

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At a glance

Temperature
22–27 °C
pH
7.0–7.5
Diet
Herbivore
Adult size
Approximately 1–1.5 cm
Temperament
Peaceful

About this species

Clithon sowerbianum (Récluz, 1843) is the accepted name in MolluscaBase/WoRMS (AphiaID 873628). Older combinations include Neritina sowerbiana and Nerita sowerbiana; WoRMS also treats Clithon sowerbyana as an incorrect grammatical variant. Shell pattern and trade name alone cannot confirm an individual. B-Aqua reports a shell length of about 1–1.5 cm and emphasizes that Clithon forms vary and may be misidentified.

Natural habitat

Records include Hong Kong, Indonesia, Japan, the Philippines, Taiwan and Vietnam. B-Aqua describes estuaries, small lagoons and lower streams with rocks and vegetation bearing algae. These transition zones can range from fresh to brackish. Such locality records do not establish where a shop animal was collected. Ask about provenance and captive-bred status; do not assume a wholly freshwater history simply because the animal is sold in a freshwater shop.

Aquarium and layout

Provide stable water, ample hard surfaces and natural growth. A new or heavily cleaned aquarium may not have enough food. The available species profile gives a minimum volume, but does not support it strongly enough for a general recommendation, so this guide avoids a litre threshold. The same source warns that Clithon may not remain healthy long-term in permanently fresh water. Buy this species only if you can establish provenance, acclimation history and appropriate salinity conditions. A secure lid helps prevent escape. Never change salinity or water chemistry abruptly.

Water conditions

B-Aqua shows temperature markers of 20, 22, 27 and 27°C and pH markers of 6.5, 7, 7.5 and 8. We show the inner values—22–27°C and pH 7–7.5—as reported husbandry guidance, not experimentally established optimum or safe limits. The source describes both fresh and brackish water and warns about permanent freshwater care. Dependable species-specific GH, KH and minimum-volume evidence was not found. Keep conditions stable and do not add salt unless using a suitable, purpose-built brackish system.

Behaviour and group size

B-Aqua describes Clithon as a peaceful grazer. Controlled trials with named aquarium companions for this exact species were not found. Avoid known snail predators and animals that pull the snail from surfaces or displace it. Nerites may climb above the waterline, so check the tank rim and use a secure lid. The medaka link below is only a limited comparison of profile values, not a general recommendation.

Feeding

The species profile describes grazing on algae and growth on glass, décor and plant surfaces. It mentions algae tablets or blanched vegetables as possible supplements but notes that acceptance may take time. This does not prove that any named commercial product is eaten or suitable as a complete staple. First ensure sufficient natural growth and monitor the animal’s condition. No catalogue product has been confirmed for this species, so none is linked.

Breeding

Egg capsules on hard surfaces do not prove that juveniles will grow up. Nerites often have a larval stage that moves toward estuaries and saltier water. B-Aqua describes this pattern for Clithon, but we found no controlled breeding study establishing a reliable home-rearing protocol for this species. Do not expect reproduction in an ordinary freshwater tank. Never add salt to a community aquarium to hatch eggs.

Keeping with fish

No controlled cohabitation trial with a named fish was found. Medaka (Oryzias latipes) appears only as a conditional profile comparison: the existing guides have a narrow overlap around 22°C and pH 7–7.5. However, the source warns that permanently fresh water may not meet Sowerby’s nerite requirements. Do not treat this as a recommendation for an ordinary freshwater community tank. Only assess the pairing individually if the snail’s provenance and salinity needs are known and actual conditions suit both animals. Avoid snail-eating fish.

Keeping with other invertebrates

No specific pairings with shrimp, other snails, crabs or crayfish have enough evidence for confirmation. That does not mean every pairing is unsuitable; reliable species-specific data are missing. Avoid predatory snails and animals that eat or grasp snails. Also consider competition for natural growth, which may be limited in an aquarium. Acclimate a new snail carefully and check that it attaches and grazes.

Exoskeleton, shell and minerals

Snails do not moult like shrimp. Shell damage or erosion can have several causes, and appearance alone is not a diagnosis. Check water stability and food availability, and seek experienced help if the problem persists. Do not add calcium, minerals or salt without a reason, and avoid copper-based treatments unless their safety for snails is confirmed.

Possible problems

Key uncertainties include permanent freshwater care, insufficient natural growth, escape and uncertain trade identification. B-Aqua raises concerns about wild collection and poor provenance information but does not provide a population assessment; this guide therefore assigns no formal conservation category. Ask the seller for the exact identification and origin. Never release aquarium animals, eggs, plants or water into the wild.

Sources & review

This care guide draws on several specialist sources and was last checked on .

View the sources