THE EFFECTS OF DIFFERENT DIETS ON THE GROWTH AND BREEDING OF GOBIOCYPRIS RARUS

In order to explore a proper bait of larva and adult fish Gobiocypris rarus, we randomly divided hatchetfish, 35 day after hatching, into five groups: Group A was fed with Artemia nauplii; Group B was fed with A. nauplii for 6 days, and was fed with commercial micro pellet diet for 1 day per week; Group C was fed with A. nauplii for half a week, and was fed with artificial diet for another half a week; Group D group was fed with A. nauplii for 1 day per week, and was fed with artificial diet for 6 days per week; Group E was fed the artificial diet. Each group was fed with a feeding satiation strategy. Each 2 weeks, growth and survival indicators were counted until 21st week (147th day). Reproductive capacity and offspring abnormal rate were calculated after spawning. The gonads obtained in 17th week (119th day) were used for histological studies. The results showed that: (1) In group E group, survival and specific growth rates were significantly lower than other groups (P<0.05); (2) reproductive capacity of group B was significantly higher than other groups (P<0.05); (3) different feeding strategies had no significant effect on testis maturity, while had influence on ovarian maturation. The results of this study suggest that addition ofA. nauplii contains superior results than single feeding with commercial micro pellet diet, which was more conducive to the growth and reproduction of G. rarus. We suggested that optimal feeding ratio for A. nauplii and commercial micro pellet diet is 6﹕1, that would be more appropriate for larvae and juvenileG. rarus in the process of standardized cultivation.