Effect of Ergosan on semen quality of male rainbow trout (Oncorhynchus mykiss) broodstock

Present study was conducted to investigate the effect of Ergosan on seminal plasma compositions and spermatological parameters in rainbow trout. Male rainbow trout broodstocks (2300 ± 200 g) were fed diets containing Ergosan at 2 different concentrations (6 mg kg−1 and 20 mg kg−1) and control diet without Ergosan for 20 days and on day 22 fish semen were sampled. Results suggest that Ergosan in dietary intake, significantly increased the spermatocrit and sperm count in 20 mg kg−1 group and Ca2+ in both treatment groups compared to control group (P < 0.05). The values of aspartate aminotransferase (AST) and lactate dehydrogenase (LDH) had significant decrease in both treatment groups compared to the control group (P < 0.05). Significant correlations were determined between sperm count versus K+ value (r = −0.838, P < 0.05) and glucose level (r = +0.835, P < 0.05) in fish administrated with 20 mg kg−1 of Ergosan. In group treated with 6 mg kg−1, significant correlation between Na+ and duration of sperm motility (r = +0.999, P < 0.05) was shown. Meanwhile, glucose level versus percent of sperm motility (r = +0.866, P < 0.05) showed significant correlation in this group. Sperm count versus total protein level (r = +0.817, P < 0.05) showed significant correlation in control group. Results indicated that Ergosan had a potential efficacy on semen quality in rainbow trout broodstock.