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Survival rate of juvenile chum salmon Oncorhynchus keta in rivers

Survival rate of juvenile chum salmon Oncorhynchus keta in rivers

Voprosy Ichtiologii 6(4): 708-719

ISSN/ISBN: 0042-8752

The downstream migration of juvenile chum salmon (Oncorhynchus keta) released in the Yasnomorka River continues for more than 1 1/2 mo. Night migration, timidity, feeding by day in shallows, schooling behavior, etc. are characteristic of the juveniles, i.e., all those traits which characterize the behavior of juveniles of natural spawning during river life. Most deaths of the migrating juvenile chum salmon are caused by the predatory fishes kundzha (Salvelinus leucomaenis), Dolly varden trout, and cherry salmon (Oncorhynchus masu) and by a drop of the river level. The total death of the juvenile chum salmon during the downstream migration period was a bit more than 9%. Greatest damage was inflicted by the kundzha, then the Dolly varden and cherry salmon. The smallest population of predators during the migration period of the chum salmon was observed at the end of June, and their minimal concentration in the lower reaches of the river. The level of the river is stabilized by the end of the migration period. As a consequence of the identical hydrological regime of rivers and the composition of predators on the southwestern coast of Sakhalin, the magnitude of the death of released juvenile chum salmon is approximately the same as their death in the Yasnomorka River. Taking into account the size of the predators and their number and distribution in time and along the length of the river, migrant juvenile chum salmon for protection, should be grown to larger size and released in the lower reaches of the river at the end of May or beginning of June.

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Accession: 025623641

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