Estimation of Surfagon Influence on the Gonadal State of Rainbow Trout Parasalmo mykiss (=Oncorhynchus mykiss) Juveniles at the Background of Temperature Stress
| Autor: | E. D. Pavlov, D. S. Pavlov, A. G. Bush |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
endocrine system Gonad Sexual differentiation urogenital system 010604 marine biology & hydrobiology Connective tissue 04 agricultural and veterinary sciences Aquatic Science Biology 01 natural sciences Temperature stress Heat stress Andrology medicine.anatomical_structure 040102 fisheries medicine 0401 agriculture forestry and fisheries Rainbow trout General Agricultural and Biological Sciences Parasalmo mykiss Spermatogenesis |
| Zdroj: | Journal of Ichthyology. 58:417-424 |
| ISSN: | 1555-6425 0032-9452 |
| DOI: | 10.1134/s0032945218030116 |
| Popis: | Regulatory effect of surfagon—a synthetic analog of gonadotropin-releasing hormone—on the gonad state of rainbow trout (Kamchatka steelhead Parasalmo mykiss (=Oncorhynchus mykiss)) juveniles is investigated. The juveniles were 2.5 months old and were exposed to brief (4 days) heat stress (19–20°C). The increase of water temperature was followed by anomalies of gonads after 1 month (destruction of sex cells and hypertrophy of connective tissue). In females, the increased water temperature activates sex redetermination: in ovaries, cysts containing destroyed spermatogonia are found. In 1.5 months, the exogenous application of surfagon was followed by acceleration of spermatogenesis in gonads of experimental fish (2.5 months old) and by a slight decrease of fraction of anomalies in structure of their testes compared with the gonads of fish not exposed to surfagon. Exposure of rainbow trout to surfagon prior to sex differentiation is more efficient than after it is completed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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