Effect of food amount and temperature on growth rate and aerobic scope of juvenile chum salmon

Offshore migration of Pacific salmon Oncorhynchus spp. is partly triggered by increasing body size and high motility in the early stages of life. The survival of juvenile salmon may depend on their growth rate during the first few months in the sea, and this factor partly regulates the dynamics of a...

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Bibliographic Details
Published in:Fisheries science 2022-05, Vol.88 (3), p.397-409
Main Authors: Iino, Yuki, Kitagawa, Takashi, Abe, Takaaki K., Nagasaka, Tsuyoshi, Shimizu, Yuichi, Ota, Katsuhiko, Kawashima, Takuya, Kawamura, Tomohiko
Format: Article
Language:English
Subjects:
Bioenergetics
Biomedical and Life Sciences
Body size
Body weight
Fish & Wildlife Biology & Management
Food
Food availability
Food Science
Food supply
Freshwater & Marine Ecology
Freshwater fishes
Growth rate
High temperature
Juveniles
Life Sciences
Marine fishes
Migrations
Minors
Offshore
Oncorhynchus keta
Original Article
Salmon
Survival
Temperature
Water masses
Water temperature
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Summary:Offshore migration of Pacific salmon Oncorhynchus spp. is partly triggered by increasing body size and high motility in the early stages of life. The survival of juvenile salmon may depend on their growth rate during the first few months in the sea, and this factor partly regulates the dynamics of adult populations. Here, we assessed the effects of water temperature and food availability on the growth of juvenile chum salmon O. keta . In addition, by combining the measurements of metabolic performance for growth and activity (Absolute Aerobic Scope: AAS) with a bioenergetics model, we estimated the energy allocation for different activities in the juveniles. Under high temperatures (14 °C), juveniles reared at low food levels (1% body weight) allocated less than half their energy for growth than those reared at high food levels (4% body weight). These findings suggest that high temperature and low food level constrain the growth of juveniles, providing an insight into the effect of the recent increase in warm and low-nutrient water masses on survival of juveniles and catches of adult chum salmon on the Pacific side of Honshu Island, Japan.
ISSN:0919-9268
1444-2906
DOI:10.1007/s12562-022-01599-w