Abstract
Fry of five species of salmonids are found in the lower reaches of the Ozernaya River. The most abundant are chum salmon and pink salmon which compose the bulk of fry which migrate downstream from the river to the sea. The dates and duration of migration of particular species differed according to the specific traits of their biology. Pink salmon is characterized by a simple migration strategy: it migrated downstream in a short time after emergence from the ground. Chum salmon has two strategies of downstream migration: some fry start migration soon after emergence, and others remained in the river for several weeks. Downstream migration of pink salmon occurred mainly at night in contrast to that of chum salmon, over 24 h, the part of daytime increased with growth of the fish. Migration of pink salmon was passive. Passive migration of chum salmon changed into active-passive with growth of the fish. The ratio of fish in the inshore zone and in the current was different in the course of 24 h. The number of fish in the inshore zone decreased in the period of intensive downstream migration.
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Original Russian Text © D.S. Pavlov, E.A. Kirillova, P.I. Kirillov, V.K. Nezdolij, 2015, published in Izvestiya Akademii Nauk, Seriya Biologicheskaya, 2015, No. 1, pp. 52–62.
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Pavlov, D.S., Kirillova, E.A., Kirillov, P.I. et al. Downstream migration, behavior, and distribution of fish fry in the lower reaches of the Ozernaya river (Southwestern Kamchatka). Biol Bull Russ Acad Sci 42, 43–53 (2015). https://doi.org/10.1134/S1062359015010094
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DOI: https://doi.org/10.1134/S1062359015010094