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The objective of the study was to investigate the effect of saline solution  containing cations (Na+, K+, Ca+2, Mg+2) on sperm motility performance  (duration of sperm motility and percentage of motile spermatozoa) and  fertilizing capacity of sperm (fertilization rate, hatching rate, larvae  length during hatching, larvae length during active feeding and survival  rate) in silver carp. The results suggested that solutions containing ions  did not improve the duration of sperm motility. The same was observed for  the percentage of motile spermatozoa. Fertilization rate influenced by  solutions containing Ca+2, and other ions could not affect this parameter.  The results showed that hatching rate was higher in solutions containing 99  mEq/L NaCl, 2 mEq/L MgCl2 and 2, 4 mEq/L CaCl2 respectively. Also, survival  rate was higher in the solution containing 2 mEq/L MgCl2 and 36 mg/dL KCl  respectively.With regard to the obtained results, it was concluded that  using appropriate activation medium can improve quality of fish sperm and  subsequently increases artificial reproduction performance

The effect of cations on sperm motility performance and fertilizing ability of silver carp Hypophtalmychtis molitrix