Journal
FISHERIES SCIENCE
Volume 67, Issue 6, Pages 1030-1035Publisher
JAPANESE SOC FISHERIES SCIENCE
DOI: 10.1046/j.1444-2906.2001.00358.x
Keywords
archival tag; chum salmon; foraging efficiency; vertical movements
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The vertical movement of a chum salmon Oncorhynchus keta returning to Japan was examined using a depth-recording archival tag in the western North Pacific Ocean over a 23-day period. The chum salmon showed clear diel vertical movements, with an average swimming depth of 12.8 m during the day and 4.8 m at night. The chum salmon spent 48% of the day and 85% of the night in the upper 10 m, 30% of the day and 10% of the night in the 10-20 m layer, and 20% of the day and 5% of the night in the 20-60 m depth layer. The chum salmon remained in the top part of the water column and rarely went below 40 m and only went below 50 m on 3 days out of the 23 days. The diel vertical movement of the chum salmon may be related to maximization of foraging efficiency.
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