Abstract
Problem statement: Because of dramatic declines in stocks of endangere d Caspian brown trout males, Salmo trutta caspius in Caspian Sea, each male brooder is stripped indi spensably more than once during the spawning season in other to ar tificial insemination in hatchery. The aim of the present study was to assay the changes of indicator s of semen quality (sperm motility, sperm production, semen volume and chemical composition of seminal fluid) during these sequential strippings. Approach: The 11 tagged males were stripped four times every 12-14 days with beginning of spermiation period (2 December 2008) towards its end (10 January 2008). One-way Analysis Of Variance (ANOVA) was employed to analyze differences between means of semen parameters. Also, the relationships between semen p arameters were tested using the bivariate correlation coefficients of Pearson. Results: The semen volume, sperm density, osmolality and the concentrations of Na + , Cl - , K + , Ca 2+ , Mg
Highlights
The availability of semen with desirable quality is one of the critical factors necessary to increase the efficiency of artificial fertilization of fish species
The values of semen volume, sperm density and spermatocrit declined by increasing of stripping frequency as previously reported for Atlantic salmon, salmo salar[1], but unlike that seen over weekly stripping f rom landlocked salmon, Salmo salar M. sebago girard[32] and biweekly stripping from rainbow trout[35]
The hydration could be due to the hypotonicity of freshwater environment, possibly causing the dilution of semen and leading to a higher semen volume and subsequently lower sperm density and spermatocrit as this subject is supported by the observations of Morisawa et al.[28]
Summary
The availability of semen with desirable quality is one of the critical factors necessary to increase the efficiency of artificial fertilization of fish species. Several studies have described semen characteristics which can influence quality. For example: Sperm density, sperm motility and the composition of seminal fluid[34]. Seminal fluid has a unique composition regarding the presence of the organic and inorganic components which support the viability of spermatozoa. For example: Minerals (Potassium, Sodium, Magnesium, Calcium and Chloride), pH, osmolality, proteins, glucose and triglyceride[12,18,19,23,29]. As well as the composition of seminal fluid, sperm motility and sperm density determine the fertilization capability of spermatozoa and often are used to estimate semen quality[2,17,24]
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