A bioenergetics model for an air-breathing fish, Channa striatus |
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Authors: | Jianguang Qin Xi He & Arlo W Fast |
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Institution: | (1) Hawaii Institute of Marine Biology, University of Hawaii at Manoa, P.O. Box 1346, Kaneohe, HI, 96744, U.S.A;(2) Present address: School of Biological Sciences, Flinders University, GPO Box 2100, Adelaide, 5001, Australia;(3) Joint Institute for Marine and Atmospleric Research, University of Hawai at Manoa, Honolulu, HI, 96822, U.S.A;(4) Present address: Massachusetts Division of Marine Fisheries, 30 Emerson Ave, Gloucester, MA, 01930, U.S.A |
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Abstract: | Food consumption, standard metabolism, and growth of juvenile snakehead, Channa striatus, a cannibalistic and air-breathing
fish were measured at 24–26 °C under controlled laboratory condition. Snakehead weighing 3.2–29.5 g were evaluated, and were
fed smaller snakehead. Based on our observations, we determined bioenergetics relationships between specific food consumption,
metabolic rates, and body weight. These values, along with other published parameter values allowed us to construct a bioenergetics
model for snakehead. We then verified our model with growth and food consumption measurements from an independent feeding
trial. Predicted fish growth closely matched observed growth. Our model underestimated cumulative food consumption when a
constant activity value was used, but consumption estimates improved when we used non-constant activity values (1-5 times
of standard metabolism). Predicted fish maintenance ration was 1.7% of body weight per day. Food conversion efficiency was
greatest (0.59) when fed 2% body weight daily, but declined when daily consumption exceeded 6% body weight. This model provides
a useful approach for assessing food requirements of snakehead under controlled condition.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | growth consumption metabolism body weight |
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