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Showing 1 results for Sexual Hormones

S. Naseri , H. Hosseinzadeh Sahafi , H. Abdolhay , A. Sepahdari, M. Sayyad Bourani ,
Volume 1, Issue 1 (4-2023)
Abstract

The aim of the present study was to investigate the sexual maturation process and changes in some immune parameters of female rainbow trout reared in a cage in the Caspian Sea. All-female fish with an average weight of 122±5 g were prepared from a local farm and released into a cage. Fish were fed daily. Blood samples were collected from 5 fish randomly once a month from January 2015 to May 2016. The levels of 17 β-estradiol, testosterone, progesterone, melatonin, vitellogenin, calcium, lysozyme, and immunoglobulin M (IgM) were measured. Water quality parameters were also measured daily. The results showed that the levels of sex hormones gradually increased over time. Also, an increase in the amount of vitellogenin (from 382.40±55.26 ng.ml-1 in January to 686.40±86.34 ng.ml-1 in May) and calcium ion (from 12.84±1.42 mg. dl-1 in January to 19.04±1.55 mg. dl-1 in May) was observed (p<0.01). However, melatonin levels decreased from January (294.20±16.89 ngl-1) to May (175.00±17.54 ng. l-1) (p<0.01). Immune parameters (Lysozyme and IgM) changes were similar and the highest levels were observed in March, which was significantly higher than other months (p<0.01). The findings suggest that female Rainbow trout are under normal sexual maturity process in the Caspian Sea like freshwater resources.
 

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