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Neritina sp. "O-Ring" is a small freshwater nerite snail from the genus Neritina, also sold under the name Neritina Batik spp. Its contrasting, irregular ring-like pattern explains the “O-Ring” name. This wild-collected nerite is best suited to mature aquariums with surfaces covered in algae and biofilm. It moves slowly across glass, rocks, and décor while grazing on natural deposits. Very common in the aquarium trade, it is peaceful and does not damage healthy plants. Its care nevertheless requires mineral-rich water to help maintain a sound shell.

General species description

Neritina sp. "O-Ring" is a nerite snail in the genus Neritina, sold as an undescribed form or species under the name “O-Ring.” Like other nerites, it is mainly active on hard surfaces and helps control biofilm in the aquarium. Its behaviour is generally calm, and it does not threaten living plants. Aquarium specimens are wild-collected, so slow acclimation is preferable. This trade name is very common in the ornamental aquarium market, although identification to species level may vary between shipments.

Geographical origin and biotope

The name Neritina sp. "O-Ring" refers to a nerite from the Indo-Pacific region, where Neritina species inhabit coastal streams, estuarine areas, and waters influenced by tides. The biotope commonly includes rocks, wood, and firm surfaces covered with algae or biofilm. These habitats may contain freshwater upstream and more mineral-rich water downstream. In an aquarium, clean, well-oxygenated water with adequate minerals better suits its needs than very acidic water with low carbonate content.

Precise locality and local name

The trade name “O-Ring” alone does not establish a precise locality. “Neritina Batik spp.” is a commercial name referring to the decorative appearance of the shell rather than to an established regional vernacular name. In aquarium stores, it is generally sold as O-Ring Nerite, Batik Nerite, or Batik snail. For reliable identification, the collection locality should be retained whenever it is supplied with the shipment. This information is especially useful for documenting the origin of wild-collected snails.

Appearance and physical characteristics

The shell of Neritina sp. "O-Ring" is rounded, low-profile, and strongly calcified. It has a brown, beige, or olive background crossed by lines and circular markings that may resemble rings; pattern intensity varies from one individual to another. The foot is generally dark, while the sensory tentacles are thin and mobile. As in other nerites, the operculum closes the shell opening when the animal retracts. Adult size reaches approximately 2.5 cm, with variation according to age and growing conditions.

General diet

Neritina sp. "O-Ring" mainly grazes on soft algae, diatoms, and the natural biofilm that develops on glass, rocks, and wood. A newly established aquarium may therefore lack food even when the water looks clean. Algae-based wafers or other vegetable foods can be offered near its feeding areas. Blanched vegetables may also be offered occasionally. Fish waste should not be considered a food source: regular supplemental feeding and moderately mineral-rich water support shell growth.

Essential data

• Name of the source river: not specified.
• Local name used: O-Ring Nerite, Batik Nerite, Batik snail.
• Origin of the scientific name: Neritina is the genus name; sp. indicates identification only to the genus level.
• Etymology of the full name: Neritina is a diminutive of Nerita, a name associated with nerite snails; sp. abbreviates species; O-Ring describes the shell’s ring-like pattern.
• Common/vernacular names: O-Ring Nerite, Batik Nerite, O-Ring snail, Batik snail.
• Family: Neritidae.
• Subfamily: Neritinae.
• Name pronunciation: neh-ri-TEE-nah — ESS-pee-seeze.
• Discovery: not specified for this commercial designation.
• Maximum adult size: approximately 2.5 cm.
• Water temperature and pH: approximately 22 to 28 °C; pH 7.0 to 8.2.
• Appearance of the watercourse and surrounding vegetation: coastal streams and estuarine areas with rocks, wood, algae, and biofilm; riparian vegetation depends on the locality.
• Typical tankmates: small freshwater shrimp, small rasboras, peaceful small tetras, non-predatory gobies, and other peaceful snails.
• Temperament and behaviour: peaceful and primarily grazing; it moves slowly over hard surfaces and may remain still during acclimation.
• Water depth: shallow to moderately deep areas of coastal streams and estuaries.
• Sexual dimorphism: difficult to distinguish externally.
• Bottom structure and flow: hard bottoms with rocks, wood, and colonized surfaces; low to moderate flow, sometimes stronger in streams.

In your aquarium

Success with Neritina sp. "O-Ring" depends on a mature aquarium, stable water, and a reliable supply of biofilm. Use effective filtration without excessive flow, provide natural grazing surfaces, and monitor hardness and carbonate levels. Avoid treatments containing copper, which can be fatal to invertebrates. Because this snail is wild-collected, gradual acclimation and careful observation after introduction are recommended. Supplemental feeding becomes essential when the aquarium is very clean or poor in algae and minerals.