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Energy and ration requirements of juvenile Pacific halibut ( Hippoglossus stenolepis ) based on energy consumption and growth rates
Author(s) -
Paul A. J.,
Paul J. M.,
Smith R. L.
Publication year - 1994
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 - 10.1111/j.1095-8649.1994.tb01273.x
Subject(s) - halibut , biology , zoology , fishery , hippoglossus hippoglossus , shrimp , juvenile , predation , meal , fish <actinopterygii> , aquaculture , ecology , food science
Growth of captive juvenile Pacific halibut was linearly related to energy consumption (J g −1 day −1 ) at 4°C by the following equation: growth (% body weight (b.w.) day −1 )=0–007 (consumption J g −1 day −1 )– 0.192; r 2 =0.81. Weight gain was independent of size for fish between 9 and 7000 g when growth was expressed as a function of consumption in J g −1 day −1 . Maintenance ration determined in feeding–growth experiments averaged 27.4 J g −1 day −1 at 4–0°C. Small halibut ate significantly more food than large fish. Single meals following 2 day fasts averaged 4.1% b.w. for halibut under 100 g, 1.72% b.w. for 1.2 kg fish and 1.1% B.W. for 6.8 kg fish. Both large and small size categories of halibut tended to evacuate their meal in about 3 days even though small fish ate relatively larger meals. Minimum estimates for daily ration to achieve growth rates observed in the Gulf of Alaska were approximately 0.5 to 2.4% b.w. day −1 depending on fish size and whether northern shrimp or yellowfin sole were their prey.