Demographic patterns in the peacock grouper Cephalopholis argus, an introduced Hawaiian reef fish

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2012-05
Authors
Donovan, Mary Kristen
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[Honolulu] : [University of Hawaii at Manoa], [May 2012]
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Abstract
This study utilizes a unique opportunity to collect large sample sizes of a coral reef fish species across a range of physical and biological features of the Hawaiian Archipelago in order to investigate variability in the demography of an invasive predatory coral reef fish, Cephalopholis argus (Family: Serranidae). Age-based demographic analyses were conducted at 10 locations on four islands in the main Hawaiian Islands. Estimates of weight-at-length, size-at-age and longevity were compared among locations. Each metric differed among locations, although patterns were not consistent. Length-weight relationships for C. argus differed among locations and individuals weighed less at a given length at Hilo, the southernmost location studied. Longevity differed among and within islands being greater at locations on Maui and Hawaii compared to the more northern locations on Oahu and Kauai. Within-island growth patterns differed at Kauai, Oahu, and Hawaii. This work provides a case study of fundamental life history information from distant and/or spatially limited locations that are needed for developing robust fishery models. The differences observed both among and within islands indicate that variability may be driven by cross-scale mechanisms that need to be considered in fisheries stock assessments and ecosystem-based management.
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M.S. University of Hawaii at Manoa 2012.
Includes bibliographical references.
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Cephalopholis argus, Hawaii, coral reef fish, zoology
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Theses for the degree of Master of Science (University of Hawaii at Manoa). Zoology.
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