The use of high quality gametes from captive fish broodstock has great importance for ensuring the production of valuable offspring for aquaculture (Kjorsvik et al. 1990). Sperm quality of male broodstock affects the production of healthy larvae. In commercial fish farming, the evaluation of sperm quality has great importance for the efficiency of artificial propagation and other processes such as freezing semen (Cruz-Casallas et al. 2007). Several factors have been documented to evaluate the sperm quality including motility, spermatocrit, spermatozoa concentration, fertilizing capacity, osmolality and pH of seminal plasma, chemical composition of seminal plasma and several others (Rurangwa et al. 2004). Determination of sperm quality parameters such as seminal plasma composition, sperm production characteristics and sperm motility traits could help us to develop and improve artificial reproduction in fish farms (Alavi et al. 2008 a). Artificial reproduction and culture of this fish in land pool and renewal of Rutilus frisii kutum stocks in Caspian Sea started since 1982 (Razavi 1995). Based on information published in the literature, there is no information about semen in this fish. Therefore, the knowledge on the biological aspects of sperm suchas seminal plasma composition and sperm motility in this species can provide for aquaculturists with practical approaches in male broodfish handling and management. The aims of this study were to determine the chemical composition of seminal plasma (glucose, total protein, Na+, K+, CatJ, Mg+2and pH), sperm production characteristics (milt volume, sperm density, spermatocrit), and sperm motility (percentage and duration of motility). Also, correlations between the sperm parameters and the composition ofseminal plasma were investigated.
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