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 Capoeta gracilis with 171 fish samples that obtained in December 2015 to May 2016 Electroshocker devices. Sex ratio of male to female was 1.67:1 that showed significant difference between sex ration of male to female in population (X2 = 6.211, p < 0.05). Maximum total length and weight were 199 mm and 122.43 g for females, 191 mm 93.37 g for males. The weight - length relation of female was W = 0.0097 TL3.11 (r2 = 0.99) and the weight - length relation of male was W = 0.0142 TL2.94 (r2 = 0.99) and the total relation was W = 0.0124 TL3.00 (r2 = 0.99). The results showed positive allometric growth for female and negative allometric growth for male and Isometric growth for the population (t-test, tmale= 2.09, tfemale = 2.77, tpopulation= 0.09, p < 0.05). Average absolute fecundity was 17978.11, while relative fecundity (eggs/g) were 1434.06. Eggs diameters were ranged from 0.10 to 0.98 mm with a mean value of 0.44 mm. The highest mean Gonadosomatic for females and for males in April was observed in June, 4.75 and 7.51 for female and male respectively.
کلیدواژهها [English]