Abstract
Juvenile scalloped hammerhead sharks, Sphyrna lewini, are apex predators within their nursery ground in Kāne‘ohe Bay, Ō‘ahu, Hawai‘i. Understanding daily maintenance requirements of a top-level predator is an important step toward understanding its ecological impact within a nursery ecosystem. Juvenile S. lewini were fed a range of daily ration levels to examine the effect of feeding rate on growth and gross conversion efficiency. The von Bertalanffy growth model yielded the best fit to the data, predicting a maintenance ration of 115 kJ kg−1 day−1 (3.4% body weight (BW) day−1) and a maximum growth rate of 38 kJ kg−1 day−1. This finding is in agreement with the previous prediction of high energetic requirements for S. lewini. In combination with the hypothesized food limitation within Kāne‘ohe Bay, this result may explain the observed high mortality rates of S. lewini. Gross conversion efficiency, K 1, ranged from −36% to 34%, with maximum efficiency at feeding levels of 5.1% BW day−1. The growth conversion efficiency of S.␣lewini is similar to that of lemon sharks and teleost fishes. Growth rates of juvenile S. lewini are possibly restricted by their high metabolic rate, limited food availability and foraging inexperience. By directly examining the effect of ration size on growth and food conversion, it was possible to resolve discrepancies between earlier studies, which used respiratory metabolism and gut content analyses.
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Acknowledgements
For assistance in capturing and maintaining sharks in captivity, I am indebted to a number of undergraduate and high school research assistants. I thank E. Aus, P. Breen, C. Brown, M. Burns, K. Castro, S. Crowley, J. Dale, E. Grau, S. Hada, J. Hazelhurst, L. Itano, S. Kim, M. Kay, T. Korte, A. Long, C. Olito, E. Russo. I also thank C. Durso and her students from Mililani High School, E. Kenner and his students from Castle High School, M. Taira and her students from Farrington High School, and the Upward Bound program and students. I thank G. Cliff, Harkins et al. (A. Bush, H. Harkins, K. Holland, C. Lowe and B. Wetherbee), Lowe et al. (A. Bush, H. Harkins and C. Lowe) and J. Luecke (Maui Ocean Center) for use of their unpublished data. I gratefully acknowledge E. Cortes, J. Dale, J. Parrish, Y. Papastamatiou and two anonymous reviewers for comments and helpful critiques of this manuscript. Financial support for this study was provided by the ARCS foundation, the EECB NSF G-K12 program, the Hawai‘i Institute of Marine Biology, a NSF predoctoral fellowship, PADI Foundation, and the University of Hawai‘i Shark Lab. This research was approved by the University of Hawaii Animal Care and Use Committee (#02-023).
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Duncan, K.M. Estimation of daily energetic requirements in young scalloped hammerhead sharks, Sphyrna lewini . Environ Biol Fish 76, 139–149 (2006). https://doi.org/10.1007/s10641-006-9016-5
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DOI: https://doi.org/10.1007/s10641-006-9016-5