Document Type : Biology(Animal)
Authors
1
Department of Fisheries, Science and Research Branch, Islamic Azad University, P.O. Box: 14515/775, Tehran, Iran.
2
Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran
3
Department of Fisheries, Science and Research Branch, Islamic Azad University, P.O. Box: 14515/775, Tehran, Iran
Abstract
The success of artificial reproduction requires rapid assessment of fish sperm characteristics followed by the ovum. This study was conducted to investigate relationship between sperm characteristics including semen volume, percentage of motile sperm, sperm motility, sperm density and spermatocrit with morphological characteristics of male broodstocks of Caspian kutum (Rutilus kutum). Forty males (3-4 years) were randomly selected from the fish captured in the west-southern of the Caspian Sea and their Spermatological parameters (semen volume, sperm density, sperm motility, percentage of motile sperm, and spermatocrit) and some morphological characteristics (weight and fork length) were individually determined. The average weight and fork length of the fish were 758.00±49.20 g and 40.35±3.72 cm, respectively. In addition, each fish had sperm volume of 2.15±0.27 mL with motile percentage of 75.36±8.65%. Sperm motility, sperm density, and spermatocrit were 41.45±3.48 s, 14.93±1.21 ×109 mL-1, and 89.75±2.45 %. The results showed that spermatocrit had significantly positive correlation with fork length (0.886) and (0.886) body height of the fish. A significant negative correlation was also obtained between fork length and sperm density (-0.829) showing a decrease of sperm density by increasing fork length in the Caspian kutum. The results of the present research showed that fork length and body height could be used as appropriate indices for identification of sperm density and spermatocrit in Caspian kutum, whereas fish weight had no significant correlation with spermatological parameters.
Keywords
)
