The Comparative Characteristics of Naturally Produced and Hatchery-Reared Juvenile Pink Salmon, Oncorhynchus gorbuscha (Walbaum, 1792), from Sakhalin Oblast
| Autor: | K. A. Proskuryakov, G. S. Rudakova, O. V. Zelennikov, M. S. Myakishev |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
biology 010604 marine biology & hydrobiology Zoology 04 agricultural and veterinary sciences Aquatic Science Body size Oceanography biology.organism_classification Body weight 01 natural sciences Hatchery Retained yolk sac medicine.anatomical_structure Fresh water 040102 fisheries medicine 0401 agriculture forestry and fisheries Juvenile Oncorhynchus Yolk sac |
| Zdroj: | Russian Journal of Marine Biology. 46:12-21 |
| ISSN: | 1608-3377 1063-0740 |
| Popis: | The body size and weight characteristics were analyzed and the morpho-physiological condition of the system of internal organs was studied in wild juvenile pink salmon caught from five rivers during downstream migration, as well as in hatchery-reared juveniles collected prior to release from all 22 salmon hatcheries of Sakhalin Oblast where they were produced in 2016 and 2017. It was found that the body weight of wild juvenile pink salmon from different rivers and in different years varied significantly. Hatchery-reared fry before release were 1.5–2.5 times larger than wild ones on average; at different hatcheries, the body weight of fry closely correlated with the sum of the accumulated degree-days. All fry from natural spawning grounds during the downstream migration had remnants of a yolk sac, although some of them were already actively feeding in fresh water. Hatchery-reared fry, irrespective of their growth rate, also retained yolk sac remnants before release. In all groups of wild and hatchery-reared juveniles different variants of the micromorphological organization of hepatic parenchyma were identified. |
| Databáze: | OpenAIRE |
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