نوع مقاله : زیست شناسی (جانوری)
نویسندگان
گروه شیلات، دانشگاه گنبدکاووس، گنبدکاووس، ایران، صندوق پستی: 163
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
To study the biological characteristics of Paracobitis hircanica with 150 fish samples that obtained in December 2015 to May 2016 with trawl net. Sex ratio of male to female was 1:0.65 that showed significant difference between sex ration of male to female in population (X2 = 6.83, p < 0.05). Maximum total length and weight were 87 mm and 5.30 g for females, 104 mm 7.31 g for males. The weight - length relation of female was W = 0.0085 TL2.89 (r2 = 0.97) and the weight - length relation of male was W = 0.0109 TL2.74 (r2 = 0.98) and the total relation was W = 0.0099 TL2.80 (r2 = 0.97). The results showed Isometric growth for female and negative allometric growth for male and population (t-test, tmale= 6.31, tfemale = 1.61, tpopulation= 5.03, p < 0.05). Average absolute fecundity were 328.86, while the relative fecundity (eggs/g) were 110.56. Eggs diameters were ranged from 0.45 to 1.79 mm with a mean value of 0.99 mm. The highest mean Gonadosomatic (GSI) for females in April and for males in May was observed, 8.06 and 1.43 for female and male respectively.
کلیدواژهها [English]