Abstract
Cytological state of gonads and hormonal status was studied in juvenile (15-month-old) Black Sea trout Salmo trutta labrax of the two phenotypic forms (resident and migratory). The differences in the rates of hametogenesis in the compared forms were revealed. It is shown that the spermatogenesis in the resident form is more intensive; on the other hand, the ovogenesis is slower. The levels of thyroxin and testosterone in blood are significantly higher in the groups of fish with intensively running gametogenesis. It is found that the concentration of triiodothyronine is slightly slower in the resident form than in the migratory. The correlation between levels of thyroid and sex steroid hormones is revealed.
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Original Russian Text © D.S. Pavlov, E.D. Pavlov, E.V. Ganzha, V.V. Kostin, V.Yu. Ponomareva, 2014, published in Voprosy Ikhtiologii, 2014, Vol. 54, No. 4, pp. 470–478.
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Pavlov, D.S., Pavlov, E.D., Ganzha, E.V. et al. Cytological status of the gonads and the level of thyroid and sex hormones in juvenile Black Sea trout, Salmo trutta labrax, of two phenotypic forms. J. Ichthyol. 54, 476–484 (2014). https://doi.org/10.1134/S0032945214030114
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DOI: https://doi.org/10.1134/S0032945214030114