Effects of L-ascorbyl-2-polyphosphate as vitamin C source on reproductive indices in rainbow trout Oncorhynchus mykiss

Considering to different effects of ascorbic acid on special body parameters¡ this study was conducted to investigate the effect of ascorbic acid on reproductive function in rainbow trout (Oncorhynchus mykiss). Three diets supplemented with 0¡ 100 and 1000 mg/kg L-ascorbyl-2-polyphosphate as vitamin C¡ were fed to rainbow trout broodstocks in three replicates for 16 weeks. Broodstocks with average weight of 812 ± 1.5 g were acclimated to experimental diet for two weeks. After 16 weeks¡ with the reproductive examination¡ some parameters including fecundity¡ percentage of egg fertilization¡ percentage of eyed egg¡ degree days to the eyed stage and degree days to alevin stage were measured. Results showed that in all parameters¡ significant differences were observed among the treatments (P