Growth parameters of huchen Hucho hucho (L.) in the wild and under culture conditions

摘要

The aim of this study was to determine the age and growth parameters of huchen, Hucho hucho (L.), individuals collected in the Dunajec River and from a fish farm in Pribovce. A total of 26 fish ranging in age from 5+ to 24+ were analyzed. Length-weight correlations were calculated with transformed regression equations and the von Bertalanffy growth model. The following equations were calculated for the fish from the Dunajec River - log W = -5.665392 + 3.256319 × log L; log L = 1.739815 + 0.307095 × log W; L(t) = 1451.4 × [1 - exp-0.1093 × (t - 0.1251)], and for the fish from the Pribovce farm - log W = - 7.176307 + 3.773629 _ log L; log L = 1.901699 + 0.264997 × log W; L(t) = 1394.1 × [1 - exp-0. 0997× (t - 0.1249)]. The values of Fulton’s condition coefficient for the fish from the Dunajec River and the Pribovce farm were 1.24 and 1.35, respectively. Back-calculated length-weight growth in subsequent years was higher in the fish from the Dunajec River, but both huchen groups generally exhibited positive allometric growth.