Parasitic Trichodinidae in salmonid fish cultured in Polish ponds

Abstract

Studies were carried out on qualitative and quantitative composition of ciliates from the family Trichodinidae, skin and gill parasites of five salmonid fish species cultured in three different trout hatcheries. Invasion process of Trichodinidae was described in the annual cycles. Ten Trichodinidae species were found, of which three showed mass development. Mass occurrence of Trichodinidae was accompanied by: lowering of fish condition, external changes on the skin, and sometimes also fish kills. Some conclusions have been formulated.