Effect of striping frequency on eyed eggs rate and sperm parameters quality in rainbow trout Oncorhynchus mykiss

In this research, effects of striping frequency on eyed eggs rate and sperm parameters quality in 3+ year’s age of male Oncorhynchus mykiss were investigated. Broodstock males were allocated randomly in three groups for stripping interval at weekly, 10 day or biweekly. Results show that duration of sperm motility in weekly striped males was the highest about 26.5±1.2 second. Also sperm density rate in weekly striped males had lowest amount about 38±0.9 %. Besides eyed-egg stage rate in weekly striped males had lower rate about 80.6±1.1 % which had significant difference compare to others group. Final conclusion revealed that in frequent stripping from 3 years male broodstock, weekly stripping were resulted to lower sperm quality. But when this period excess to biweekly interval, the brooder will have enough time to reproduce higher quality sperm through spermatogenesis approach.