Some Biological Properties of the Squalius cephalus (L., 1758) Population Inhabiting Apa Dam Lake in Konya (Turkey)

Abstract

In the present study, sex and age distribution, growth, reproduction properties and condition factor of Squalius cephalus (L., 1758), Inhabiting Apa Dam Lake, were investigated. The ages of S. cephalus were determined in the range of I to V. of the investigated samples, 45.36% were female and 43.46% were male. The minimum fork length of this species was 131 mm, the lowest weight was 30 g, the maximum fork length was 307 mm and the highest weight was 438 g. Relation between length and weight was calculated as W = 0.091 x L 2.43 (female+male). First sex maturity was attained at the age of II in males and III in females and spawning occurs between may and july. Monthly gonadosomatic index (GSI) values varied from 1.23 to 7.87. Fecundity increased with the age. Key Words: Squalius cephalus, age and growth, reproduction, Apa Dam Lake