Some growth parameters of Chondrostoma regium (Heckel, 1843) inhabiting Karasu River (East Anatolia, Turkey)

The present study was carried out in order to determine age and some growth parameters of brond snout (Chondrostoma regium (Heckel, 1843)) caught in 14 different stations from Karasu River (East Anatolia, Turkey). For this purpose, a total of 236 fish specimen (124 females and 112 males) of C. regium were captured between 2014 and 2016 by electroshocker. Total length and weight of C. regium ranged from 11.0 to 33.0 cm, 33.0 to 324.0 g, respectively. Female:male ratio was estimated as 1:0.903 and the age groups of C. regium were 1-7. The parameters of von Bertalanffy growth parameter estimated as Lt=40.17[1-e-0.154(t+2.14)]; Wt=495.009[1-e-0.154(t+2.14)]2.50 for combined sexes and the growth performance index (Ф') value was calculated as 2.395. The length and weight relationships were as follows: W=0.0503L2.50 (R2 = 0.97; confidence intervals of b=2.41-2.70; p<0.001). The growth type was negative allometric