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Age, growth, mortality and population characteristics of the pearl perch, Glaucosoma buergeri Richardson 1845, from deeper continental shelf waters off the Pilbara coast of north-western Australia Newman, S.J. (2002). Age, growth, mortality and population characteristics of the pearl perch, Glaucosoma buergeri Richardson 1845, from deeper continental shelf waters off the Pilbara coast of north-western Australia. J. Appl. Ichthyol. 18(2): 95-101. https://dx.doi.org/10.1046/j.1439-0426.2002.00327.x In: Journal of Applied Ichthyology = Zeitschrift für angewandte Ichthyologie. Blackwell: Berlin. ISSN 0175-8659; e-ISSN 1439-0426

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Trefwoorden

Age Aquatic organisms > Marine organisms > Fish > Marine fish ISEW, Australia, Northern Terr. Otoliths Population characteristics > Population number Population functions > Growth Population functions > Mortality Topographic features > Submarine features > Continental shelves Glaucosoma buergeri Richardson, 1845 [WoRMS] Northern Territory [Marine Regions] Marien/Kust

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Auteur		Top
Newman, S.J.

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Abstract

Pearl perch, Glaucosoma buergeriRichardson 1845, from deeper waters (>100 m depth) on the continental shelf of north-western Australia were aged by examining transverse sections of their sagittal otoliths. Ages were assigned based on counts of alternating opaque and translucent zones (annuli). Otolith length and breadth (width) increased linearly with fish length, whereas otolith weight increased linearly with fish age. The continuous growth of the otoliths provides some evidence that the opaque and translucent zones used to estimate age in this study are formed on a regular basis. Parameters of the length-weight relationship were estimated, along with parameters of the von Bertalanffy growth function. The generalised von Bertalanffy growth function (total length-at-age, both sexes combined) for G. buergeri was Lt = 512.7 (1- e-0.139(t + 0.89)). There was no significant differential growth between the sexes in observed length-at-age. The oldest individual found was a male G. buergeri estimated to be 26years of age. The annual instantaneous rate of natural mortality (M) was estimated to be 0.14. The slow growth, long life and low natural mortality rate indicate that G. buergeri is vulnerable to overfishing and that harvest strategies for this species should be conservative, given its low production potential.

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