Journal
JOURNAL OF FISH BIOLOGY
Volume 71, Issue 4, Pages 1179-1191Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1095-8649.2007.01591.x
Keywords
age-specific aggregation; cool water sources; habitat use; high water temperature; events; juvenile Atlantic salmon; Salmo salar
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This study quantified the use of cool water sources by wild 0+, 1+ and 2+ year Atlantic salmon Salmo salar during high water temperatures (i.e. > 23 degrees C) in summer 1995 and 2004. During these events, 0+ year Atlantic salmon did not aggregate or increase in abundance in cool water sites. Interestingly, 1+ and 2+ year Atlantic salmon numbers increased in cool water sites. In addition, these older juveniles formed numerous, discrete aggregations along the plume created by a tributary with aggregation locations being similar between years. Aged 2+ year fish aggregations were at the coolest sources whereas 1+ year aggregations were in locations cooler than the main river. Fish in aggregations on average used deeper sections (average depth: 380 mm) compared with the coolest available habitat in the thermal plume (average depth: 230 mm). Hence, during high temperature events, older juvenile Atlantic salmon moved to cooler water sites and then aggregated in deeper microhabitats. (c) 2007 The Authors.
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