Determination of Relationship between ages with efficiency factors Artificial Propagation in Caspian Sea kutum (Rutilus frisii kutum, Kamenskii, 1901) Spawners males in Shirood River
Subject Areas : New Technologies in Aquaculture DevelopmentKeywords: hatching, Sperm parameters, Keywords: Rutilus frisii kutum, Fertilization percent,
Abstract :
Kutum (Rutilus frisii kutum) is one of the most important fishes of the Caspian Sea which migrates annually to Iranian rivers such as Shirood River. In this research mutual effects of age have been analyzed on some sperm parameters (volume, density, spermatocrit and motility percent) of kutum (Rutilus frisii kutum) and the artificial propagation in Shirood River. For this reason acquired sperm from 30 male broods (2, 3, 4, 5 and 6 years old) were combined with ova of 30 females. Maximum weight (975 g) and total length (47.25 cm) were related to 6-year-old male broods, while minimum weight (373.33 g) and total length (35.67 cm) have been observed in 2-year-old male broods. The highest sperm volume (5.22 ml), spermatozoa density (45×109 n/ml), spermatoicrit (39.3%) and spermatozoa motility (77.4%) were related to 5, 2, 2 and 4 years old stocks, respectively. In other hand the least sperm volume (3.03 ml), spermatozoa density (30×109 n/ml), spermatoicrit (30.3%) and spermatozoa motility (74%) were related to 2, 6, 4 and 6 years old stocks, respectively. A peak percentage of fertilization (95.2%) and hatching (83%) occurred in 4-year-old, while a minimum percentage of fertilization (88.5%) and hatching (77.6%) were showed for 6 and 2 years old stocks. Statistically there were not any significant differences between different ages as sperm volume (P=0.323), spermatozoa density (P=0.539), spermatoicrit (P=0.187) spermatozoa motility (P=0.164), but fertilization percent average did not indicate significant differences between different ages groups (P=0.016). So4 years old male brood stocks are economically the best choice for artificial propagation.
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