Growth trends of Queensland east coast Spanish mackerel (Scomberomorus commerson) from otolith back-calculations

Ballagh, Aaron C., Begg, Gavin A., Mapleston, Amos, and Tobin, Andrew (2006) Growth trends of Queensland east coast Spanish mackerel (Scomberomorus commerson) from otolith back-calculations. Marine and Freshwater Research, 57 (4). pp. 383-393.

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The growth of narrow-barred Spanish mackerel (Scomberomorus commerson) was examined over a broad spatial scale encompassing the east coast of Queensland, Australia. Our aim was to use back-calculation to identify potential biases in growth estimation, and to provide a more recent estimate of growth for Spanish mackerel on the east coast of Queensland. Growth trends were determined using the body proportional hypothesis (BPH) back-calculation model and compared between back-calculated and observed length-at-age data. The back-calculated von Bertalanffy growth function parameters estimated for males and females, respectively, were L∞ = 1047 mm, K = 0.75, t0 = –0.18 and L∞ = 1248 mm, K = 0.51 and t0 = –0.39. Significant differences in growth of Spanish mackerel sampled among different regions along the east coast were observed. A comparison of back-calculated and observed length-at-age data revealed significant biases in the observed length-at-age data for younger aged fish. Our findings contrast with previous estimates of growth for Spanish mackerel from the east coast of Queensland and highlight the use of back-calculation for the first few annuli as a means of avoiding biases in growth estimation arising from gear selectivity associated with fishery-dependent samples of fast-growing fish.

Item ID: 3806
Item Type: Article (Research - C1)
ISSN: 1448-6059
Keywords: back-calculation; gear selectivity; growth comparison; narrow-barred Spanish mackerel
Date Deposited: 17 Jun 2009 05:38
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070402 Aquatic Ecosystem Studies and Stock Assessment @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830299 Fisheries- Wild Caught not elsewhere classified @ 100%
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