Document Type : مقاله
Authors
Gorgan University of Agricultural Sciences and Natural Resources
Abstract
Abstract
Relation between sexual maturity and levels of two main steroid hormones in gonads, 17- estradiol (E2)
and testosterone (T) were studied by using histological and radioimmunoassay in female kutum Rutilus frisii
kutum during spawning season of the southern Caspian Sea. The study was carried out from February to May
2008 using 105 migrated fish specimens catched from the River sefid-rood by various tools of catching
including (Gillnet, Cast net, Seine net and Sheyl or Kulham). The results revealed that changes in plasma
levels of gonadal steroids, (E2) and (T) were closely correlated with ovarian development and increased in
Gonadosomatic index (GSI) (P
Keywords
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