The assessment effect of spawning migration time on ionic ratios of seminal plasma in (Rutilus rutilus caspicus)

In this study ionic ratios of seminal plasma of (Rutilus rutilus caspicus) were investigated in spawning migration times. Therefore، migration season divided to three periods (February، March and April). Sperm samples were collected from 10 males in each period and then were transferred with ice to Gorgan university central lab. Na+ and K+ ions were measured by flamephotometere، and Ca2+، Mg2+ were measured by spectrophotometer. Na+ to K+، Na+ to Ca+2، K+ to Ca+2 and Ca+2 to Mg+2 ratios at the spawning migration times were significant (P<0. 05)، but Na+ to Mg+2 and K+ to Mg+2 ratios did not show significant difference (P>0. 05). The result showed that broodstock migrated in middle of season has the better semen quality than other seasons.