Fish part of aquatic community in trout farm area

Research results on fish from Lahti Bay of Lake Onega are presented. Changes in species composition in the area adjacent to the cage trout farm are revealed. Analysis of the ruff’s morphophysiological parameters (age, weight, length, fatness, indexes of internal organs) was carried out. High indexes of weight, size, and fatness revealed in ruff testify of favorable conditions created by the nearby opetating trout farm.