Journal
JOURNAL OF ICHTHYOLOGY
Volume 58, Issue 6, Pages 889-901Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0032945218060085
Keywords
pink salmon Oncorhynchus gorbuscha; juveniles; downstream migration; patterns of migration; Sakhalin
Funding
- Russian Science Foundation [14-14-01171]
- Russian Science Foundation [17-14-00104] Funding Source: Russian Science Foundation
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Patterns of downstream migration of juvenile pink salmon Oncorhynchus gorbuscha in the Malaya Khusi River (northeast of Sakhalin island) are revealed as a result of observations conducted in 2014-2017. Downstream migration starts in May when water is warmed up to 4-5 degrees C. The bulk of fish migrates seaward at 5-10 degrees C. The duration of downstream migration is 2.5 months. Downstream migration is confined to nocturnal period. Downstream migrants are distributed predominantly in the meadstream, at the line of fastest flow. Some species-specific mechanisms of downstream migration are made clear. The total number of pink salmon downstream migrants during the period of observations is calculated.
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