Bio-ecological properties of the tench (Tinca tinca L., 1758) distributed in Seyhan dam lake (Adana)

In this study, September 2007 - August 2008 between the Seyhan Dam Lake in 2470 showing the distribution of the fish pieces Tench (Tinca tinca L., 1758) belonging to length, weight, age and growth properties were examined. 345 of these samples (228 female, 117 male), reproduction and feeding characteristics of the period is determined.The examined sample includes 1227 female and 1243 male specimens. The total length range for females and males was 12.00-29.70cm and 12.00-27.40 cm, respectively; and the weight range for females and males was 23.72-368.00 g and 21.40-310.00 g, respectively. The length-weight relationships computed for female and male specimens was respectively as; W=0.021*L 2.890 and W=0.014*L 3.000 .The minimum and maximum ages determined based on scale readings for females and males ranged from I to V. The computed von Bertalanffy growth parameters was: L?=56.31cm, K=0.103 year-1, t0=-1.617 year for females; and L?=50.55 cm, K=0.112 year-1, t0=-1.473 year for males. The monthly GSI values are showed spawns of this species between May and August.Diet of Tench was found to be composed of Bacillariophyta (69.11%), Chlorophyta (26.08%), Cyanophyta (2.93%), Dinophyta (0.76%), Euglenophyta (0.25%), Rotifera (0.01%), Cladocera (0.10%), Copepoda (0.002%), Difflugia (0.003%), Aquatic Insecta (0.003%) and Benthic Organisms (0.002%). The mean condition factor of males and females were found as 1.874±0.023 and 1.97±0.029 respectively.