Year: 2010
Type: article
Abstract: It is hypothesized that Capoeta fusca might display specific life-history traits that differ from other species of this genus. To test this hypothesis a total of 354 specimens of C. fusca (listed by ICUN in the category DD = data deficient) were caught in the Qanat of Shadmehr (a well-known active man-made water well system in eastern Iran) on a monthly basis to cover fully the reproductive season from April to October 2007. Based on opercula readings the maximum ages of the population were 5+ years for both sexes. Sizes ranged from 57 to 190 mm total length (weight 2.14–84.76 g). Length-weight relationship implied that the growth was negatively allometric for males and isometric for females. The von Bertalanffy growth model was estimated as Lt=18.74(1-e−0.33(t+0.473)) and Lt=22.35(1-e−0.32(t+0.333)) for males and females, respectively. Sex ratio was 1 : 2.42 in favour of females. The GSI indicated that reproduction of the fish in the qanat system occurred between May and August, with the highest average value of 6.12 for males in June and 9.55 for females in July. Oocyte diameters ranged from 0.30 to 2.05 mm, with a mean value of 0.92 mm. Absolute fecundity ranged between 506 and 22 800 eggs, with a mean of 4961 eggs. Fecundity relative to total weight fluctuated from 34 to 583, with a mean value of 133 eggs per g. Absolute fecundity and oocyte diameter to fish size (length and weight) were significantly correlated.
Source: Journal of Applied Ichthyology
Authors: R. Patimar, B. Mohammadzadeh
Institutions: University of Gonabad, Tarbiat Modares University
Language: English
Subfield: Aquatic Science
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W1540142647