FRESHWATER INVERTEBRATES GASTROPODS These are often unintentionally introduced (Breeding aquarium fish)
FRESHWATER INVERTEBRATES GASTROPODS These are often unintentionally introduced into aquariums, usually via plants containing eggs or small juveniles which are difficult to spot. Gastropods lay their eggs in a small, transparent, gelatinous mass. Ampullaria Some species of the apple snail can grow to 20 cm in the wild, but those found in an aquarium (belonging to the Ampullaria genus) do not exceed 7 cm. They eat vegetation and detritus, helping to restrict the development of algae, and like fairly hard water. Unlike many other gastropods, they are sexed and lay their eggs outside the water. Size: 6-7 cm. Ampullaria gigas Planorbis These are water snails with a flattened shell. Their orange-red body contains plenty of red globules to establish a high oxygen concentration, as they live in environments lacking in oxygen and breathe through their lungs, sometimes rising to the water surface. They graze on both short and filamentous green algae, whose growth they help to restrict. Size: 3-4 cm. Malayan snails They breathe through their branchiae and can retreat into their tapered shell, which closes with an operculum. They relish the tiny algae which encrust the decor; if they are well fed, they proliferate quickly. They are considered less effective than the planorbis, but as they bury themselves, they contribute to the equilibrium of the aquarium by turning over and aerating the bed. If you want to get rid of them, introduce a fish from the Tetradon genus, which will appreciate these mollusks. Several Malayan snail species belonging to the Melanoides genus (such as Melanoides tuberculata), native to South-East Asia, can be unintentionally introduced into tanks along with plants. Size: 1-2 cm. Planorbis sp. Physas Their spiraled shell is markedly less elongate than that of Malayan snails and they are also slightly bigger. They do not play an important role in the control of unwanted algae. As they reproduce rapidly, it is best not to introduce them into an aquarium. Size: 1-2 cm.
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