Age, reproduction, and fecundity of a population of Cobitis sp. (Actinopterygii: Cypriniformes: Cobitidae) from the Babolrud River in the southern Caspian Sea basin
2011
Mousavi Sabet, H. | Kamali, A. | Soltani, M. | Bani, A. | Esmaeili, H.R. | Rostami, H. | Vatandoust, S. | Moradkhani, Z.,Islamic Azad University, Teheran (Iran). Dept. of Fisheries
Loach fishes, Cobitis sp., are found in the majority of streams in the southern Caspian Sea basin. Reproductive conditions are key parameters of fish populations and their assessment is very important for several reasons. Sampling was done at monthly intervals throughout the year and 226 individuals of Cobitis sp., were caught from the Babolrud River (Iran). Age, sex ratio, fecundity, oocytes diameter, gonadosomatic- and modified gonadosomatic indices were estimated. Sex ratio differed significantly from unity, and the percentage of females was greater than that of males. The mature females and males were longer than 45 and 35 mm in total length (+2 and +1 in age, respectively). The average egg diameter was 0.58 mm. The spawning took place from beginning of May to late July, when water temperature was between 19.1 and 24.6 deg C. The absolute fecundity was significantly related to body weight and gonad weight. Based on the pattern of gonadosomatic index, it was concluded that this fish has a prolonged active reproductive period
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