The relationship between fish size and sperm volume, hematocrite index, gonadal characteristics and spermatological parameters in Rutilus rutilus caspicus

In this research which carried out in Gorganrood within 3 months,the relationship between fish size and sperm volume, gonadal characteristics, spermatological parameters (spermatocrite, sperm density and duration of sperm motility) and hematocrit index in Rutilus rutilus caspicus of Caspian sea were investigated. Semen samples were collected from 51 kolme fish with a 5cc syringe and were immediately transported to the laboratory while were being kept on ice. With increasing in the body length, the gonadal weight significantly increased but sperm volume did not have any significant correlation with fish body length (P>0.05). Spermatocrite, sperm motility, sperm density, gonadosomatic index and hematocrit did not influenced by fish body size (P>0.05). But correlation between hematocrit index and sperm volume was significant and positive (P>0.01). With increasing in gonadal weight, sperm density significantly decreased as well (P<0.05).