Metabolic rates of juvenile scalloped hammerhead sharks (Sphyrna lewini) |
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Authors: | C Lowe |
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Institution: | Hawaii Institute of Marine Biology, University of Hawaii, PO Box 1346, Kaneohe, HI 96744, USA,
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Abstract: | Oxygen consumption of juvenile scalloped hammerhead sharks, Sphyrna lewini, was measured in a Brett-type flume (volume=635 l) to quantify metabolic rates over a range of aerobic swimming speeds and water temperatures. Oxygen consumption (log transformed) increased at a linear rate with increases in tailbeat frequency and swimming speed. Estimates of standard metabolic rate ranged between 161 mg O2 kg-1 h-1 at 21°C and 203 mg O2 kg-1 h-1 at 29°C (mean-SD: 189ᆣ mg O2 kg-1 h-1 at 26°C). Total metabolic rates ranged from 275 mg O2 kg-1 h-1 at swimming speeds of 0.5 body lengths per second (L s-1) to a maximum aerobic metabolic rate of 501 mg O2 kg-1 h-1 at 1.4 L s-1. Net cost of transport was highest at slower swimming speeds (0.5-0.6 L s-1) and was lowest between 0.75 and 0.9 L s-1. Therefore, these sharks are most energy efficient at swimming speeds between 0.75 and 0.9 L s-1. These data indicate that tailbeat frequency and swimming speed can be used as predictors of metabolic rate of free-swimming juvenile hammerhead sharks. |
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