Goroshinku also are consumed by many fishes. It lives in a coastal zone. Eats also the elementary organisms and seaweed. Fructifies at the age of a year once, all posterity - from 5 to 12 individuals - is born simultaneously.
Drejssena . It basically a small cockleshell though some copies in favorable conditions reach 50 mm. In the large rivers and reservoirs its stocks reach hundreds tons on square kilometre. Settle drejsseny on stones, piles, on cancers, cockleshells, on plants, on all firm, being attached with the help bissusnyh sheaves. Drejssena - razdelnopoloe the animal, breeds from April till the November, everyone gives approximately 300 thousand eggs. Lives on the average four-six years. By a water filtration takes from it as food small zoo- and a phytoplankton, detrit. Intensively clears water. For days each individual passes through itself about two litres of water. Drejsseny, as well as other molluscs, for many fishes are the almost basic food.
Is much and other molluscs belonging as to a class folding, and brjuhonogih. Brjuhonogie, or water snails, also are a valuable forage not only for fishes, but also for waterfowls. At the same time, it is necessary to know that brjuhonogie molluscs are the basic distributors of the various parasitic hearts dangerous to the person and for pets.