Study of gonadosomatic index of Salmo ohridanus Steindachner from Ohrid Lake

Abstract

With the aim to investigate the gonadosomatic index of Ohrid belvica (Salmo ohridanus, Steindachner, 1892), investigations were conducted on individuals captured in vegetative and reproductive development period of belvica, on three localities of Ohrid Lake: Kalista, Kaneo and Elesec, on depth from 45 to 70 m. Samples for researching have average body mass from 90 to 100 g and average total body length from 217 to 225 mm. The gonadosomatic index is the ratio of fish gonads weight to the body weight. It was found that this ratio varies from 0.12 to 6.77 for the three localities during the two stages of development, or that is an average of 0.14 to 5.86. High gonadosomatic indеxes were recorded in the reproductive development period, which suggested the spawning period.