Early Larval Growth of Pacific Halibut Hippoglossus stenolepis |
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| Authors: | Han Wu Liu Robert R Stickney Walton W Dickhoff Donald A McCaughran |
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| Institution: | School of Fisheries WH-10, University of Washington, Seattle, Washington 98195 USA;International Pacific Halibut Commission, P.O. Box 95009, Seattle, Washington 98145 USA |
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| Abstract: | Growth of Pacific halibut Hippoglossus stenolepis larvae was studied in the laboratory during 1989 and 1991. Larvae increased in length from 6.3 mm at hatching to 9.9 mm 20 d post-hatch. The average daily length increment was 0.17 mm. Dry weight of the larvae increased from an average of 210 μg at hatching to 570 μ g on day 20, providing a specific growth rate of 4.99. During the same period, mean yolk sac weight decreased from 1,390 μ g to 646 μ g, resulting in a yolk to body conversion efficiency of 48.5%. At hatching, the larval body made up only 13% of total dry weight. On day 20, the larval body made up 46.9% of the total weight. Larvae started feeding at a length of 12 mm after about 90% of their yolk sac had been absorbed. |
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