Premium
Relationships between metabolic rate, muscle electromyograms and swim performance of adult chinook salmon
Author(s) -
Geist D. R.,
Brown R. S.,
Cullinan V. I.,
Mesa M. G.,
VanderKooi S. P.,
McKinstry C. A.
Publication year - 2003
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1046/j.1095-8649.2003.00217.x
Subject(s) - oncorhynchus , chinook wind , zoology , biology , fish <actinopterygii> , muscle mass , fish physiology , bioenergetics , fishery , endocrinology , microbiology and biotechnology , mitochondrion
Oxygen consumption rates of adult spring chinook salmon Oncorhynchus tshawytscha increased with swim speed and, depending on temperature and fish mass, ranged from 609 mg O 2 h −1 at 30 cm s −1 ( c. 0·5 BL s −1 ) to 3347 mg O 2 h −1 at 170 cm s −1 ( c. 2·3 BL s −1 ). Corrected for fish mass, these values ranged from 122 to 670 mg O 2 kg −1 h −1 , and were similar to other Oncorhynchus species. At all temperatures (8, 12·5 and 17° C), maximum oxygen consumption values levelled off and slightly declined with increasing swim speed >170 cm s −1 , and a third‐order polynomial regression model fitted the data best. The upper critical swim speed ( U crit ) of fish tested at two laboratories averaged 155 cm s −1 (2·1 BL s −1 ), but U crit of fish tested at the Pacific Northwest National Laboratory were significantly higher (mean 165 cm s −1 ) than those from fish tested at the Columbia River Research Laboratory (mean 140 cm s −1 ). Swim trials using fish that had electromyogram (EMG) transmitters implanted in them suggested that at a swim speed of c. 135 cm s −1 , red muscle EMG pulse rates slowed and white muscle EMG pulse rates increased. Although there was significant variation between individual fish, this swim speed was c. 80% of the U crit for the fish used in the EMG trials (mean U crit 168·2 cm s −1 ). Bioenergetic modelling of the upstream migration of adult chinook salmon should consider incorporating an anaerobic fraction of the energy budget when swim speeds are ≥80% of the U crit .