Studying the process of sexual maturation of caspien sea adult male Shemaya Alburnus chalcoides (Güldenstädt, 1772) migratory to Anzali Wetland

Shemaya (Alburnus chalcoides) is the most important bony fishes in the Caspian Sea that migrate to breed in Anzali wetland. The present study was conducted in order to study reproductive biology in male migrant Shemaya to Anzali wetland during spawning phase from March 2013 to Jun 2014. Microscopic images of histological gonad and rate of sex steroid hormone in 16 numbers of adult male fish were studied. Results showed that the testis of fish was lobular. The result of histological image inmale fish showed that gravid fish was in the beginning of active spawning phase¡ and the spermatogonia (SG) in addition with different stage of spermatogenesis (Sc¡ St¡ Sz) were poorly observable in their tissue sample. This is while there was not observed primary stage of spermatogenesis (Sc1¡ Sc2) and spermatogonia in spawning fish andtheir lumen was full of spermatozoa that indicated the final stage of spawning. The result of sex steroid hormones showed that the rate of testosterone hormone in spawning fish was 12.13±0.68 ng/ml and in gravid fish its value was calculated as 8.77±0.55 ng/ml (P