Condition and CPUE of European grayling (Thymallus thymallus L.) population in the Croatian Kupa river

摘要: The study was carried out on the material of 98 European grayling (Thymallus thymallus L., 1758) from upper part Kupa river, in northwest Croatia. research included angling by fly fishing tackle and collecting data fish species characteristics. Values condition factor (CF) ranged 0.615 to 2.239, but average value this parameter is 1.094± ; 0.27. dates sampling indicated that all caught before November, have had a negative factor. quantity present river evaluated using catch per unit efforts (CPUE) parameter. CPUE 2.25± 1.01.