Abstract:To understand the effects of different diets on ovarian development and reproductive performance of Acrossocheilius hemispinus brood fish, the broodstock with an initial body weight of about 120 g were reared in a glass fiber reinforced plastic barrel with an inner diameter of 3.0 m, a height of 1.2 m and a water depth of 0.7—0.8 m and fed ordinary feed, water tubifex Limnodrilus hoffmeisteri and intensified diet for 30 d at water temperature of 22.0—28.5 ℃. Then the ovarian sections were histologically observed and counted, the gonado-somatic index and the ratio of developmental stage Ⅳ were calculated and the contents of crude protein, crude fat, crude ash, phosphorus and calcium and moisture were determined in ovary of A. hemispinus, with statistics of success rate, fertilization rate, and hatching rate during the artificial reproduction. There was gonado-somatic index of 9.82% in water tubifex group and 9.65% in intensified diet group, significantly higher than that in the control group (8.20%) (P<0.05). The ratio of developmental stage Ⅳ was found to be 33.16% in water tubifex group and 32.38% in intensified diet group, significantly higher than that in the control group (27.85%) (P<0.05). The significant increase in moisture was observed in ovarian in water tubifex group and intensified diet group (P<0.05), and significant increase in crude fat and phosphorus contents (P<0.05), without significant difference in the contents of crude protein, crude ash and calcium (P>0.05). There was success rate of 53.50% in ordinary feed group, 52.46% in water tubifex group and 54.28% in intensified diet group, without significant difference among the three groups (P>0.05), with significant increase in fertilization rate by 11.95% in water tubifex group and 13.74% in intensified diet group compared with that in ordinary feed group. The hatching rate was shown to be slightly higher in water tubifex group and intensified diet group than that in ordinary feed group (P>0.05). Comprehensive analysis of ovarian development and reproductive performance and other factors, feeding self-made intensified diet or worm can improve the ovarian development and reproductive performance of A. hemispinus.
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