Pointed Mud Snail (Lymnaea stagnalis)

26 October 2026

Lymnaea stagnalis, commonly called the pointed mud snail or great pond snail, is a freshwater pulmonate snail found in quiet, vegetated waters. Its tall, pointed shell and ability to breathe atmospheric air make it distinctive in aquaria. It can be a useful scavenger, but it reproduces readily when food is abundant. The supplied images are broadly consistent with this species, although photographs alone cannot confirm identification with complete certainty.

Taxonomy and identification

Lymnaea stagnalis is a gastropod mollusc in the family Lymnaeidae. It is a pulmonate freshwater snail that regularly reaches the surface to breathe air. Identification is based on its relatively large, elongated, high-spired shell, broad opening, and pointed apex. Shell color and body color vary with age, water conditions, and individual genetics, so color alone is not diagnostic. The images show pointed, high-spired snails, but some photographs may depict similar pond snails; treat the identification as probable rather than definitive.

Natural habitat

This species inhabits freshwater ponds, marshes, lakes, ditches, and slow-moving margins with submerged or emergent vegetation. It commonly grazes on surfaces, rests among plants and debris, and visits the water surface for air. Stable, well-oxygenated water and access to calcium-rich surfaces support shell growth. It is adapted to temperate conditions and can tolerate seasonal changes more readily than many tropical aquarium snails.

Aquarium water requirements

Use mature, dechlorinated freshwater with low ammonia and nitrite and stable conditions. A practical aquarium range is about 10–24 °C and pH 7.0–8.5. Moderate hardness and available calcium help prevent thin, eroded shells; very soft, acidic water is unsuitable for long-term maintenance. Provide a secure lid because these snails can climb above the waterline. Avoid copper-based medications and other treatments intended to kill invertebrates.

Feeding

Lymnaea stagnalis grazes on algae, biofilm, microorganisms, decaying plant material, and other organic matter. In an aquarium it may also accept blanched vegetables and sinking foods such as algae wafers or omnivore pellets. Offer only small portions and remove leftovers. A sudden increase in numbers usually indicates excess food or accumulated organic matter rather than a need to feed the snails more.

Plant safety

It is not reliably plant-safe. Healthy, established plants are often left largely intact while the snail consumes algae, damaged leaves, and decaying tissue, but hungry individuals can rasp soft or weakened foliage. Avoid relying on this species for algae control in a valuable planted aquarium. Supply adequate food and plant cover, and monitor delicate or newly planted species for grazing damage.

Reproduction

This species is a simultaneous hermaphrodite: each adult has male and female reproductive organs and mating commonly involves two snails. It lays gelatinous egg masses on submerged plants, glass, hardscape, or other surfaces. Under favorable conditions, eggs hatch into small crawling snails and the population can grow quickly. Eggs and juveniles may arrive unnoticed on plants, equipment, or décor. Reproduction is strongly influenced by temperature, food availability, and water quality.

Population control

Control numbers by reducing excess feeding, removing uneaten food, cleaning accumulated waste, and manually removing adults and egg masses. A baited vegetable or snail trap can collect individuals for relocation or humane disposal, but traps require frequent checking. Quarantine and inspect new plants to prevent introductions. Do not release aquarium snails into natural waterways. Avoid copper or chemical molluscicides when other livestock, plants, or the biological filter could be harmed.

Snail info

Temperature : 10–24 °C
pH: 7.0–8.5

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