Quantitative regularities of the filtration feeding of the Black Sea oyster depending on some ecological factors were studied. Influence of food concentration on filtration activity of shellfish is described. Dependences of filtration speed are certain on the body mass of oysters under different temperature conditions were found. The seasonal changes of its intensity in the Kerch Strait and the Donuzlav Estuary are illustrated. Influence of water salinity on filtration activity of the oyster is established.