Comparative biology of tropical Lethrinus species (Emperors): challenges for multi-species management

Currey, L.M., Williams, A.J., Mapstone, B.D., Davies, C.R., Carlos, G., Welch, D.J., Simpfendorfer, C.A., Ballagh, A.C., Penny, A.L., Grandecourt, E.M., Mapleston, A., Wiebkin, A.S., and Bean, K. (2013) Comparative biology of tropical Lethrinus species (Emperors): challenges for multi-species management. Journal of Fish Biology, 82 (3). pp. 764-788.

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View at Publisher Website: http://dx.doi.org/10.1111/jfb.3495
 
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Abstract

Life-history characteristics of six tropical Lethrinus species sampled from the Great Barrier Reef World Heritage Area were compared. Two species groups were identified based on fork length (LF): large species with maximum LF > 640 mm (longface emperor Lethrinus olivaceus, yellowlip emperor Lethrinus xanthochilus and spangled emperor Lethrinus nebulosus) and small species with maximum LF < 480 mm (Pacific yellowtail emperor Lethrinus atkinsoni, pink ear emperor Lethrinus lentjan and ornate emperor Lethrinus ornatus). Lifespan was not correlated with LF. Early growth for all species was rapid and similar during the first few years of life, but coefficients of the von Bertalanffy growth function varied considerably among species. Growth also differed between sexes for L. atkinsoni. Reproductive characteristics varied among species, with peak periods of spawning occurring in November to December for L. atkinsoni, July to August for L. nebulous, September to October for L. olivaceus and a protracted season for L. lentjan, although fewer samples were available for the last two species. Sex-specific LF and age distributions and gonad histology of L. lentjan were suggestive of a functional protogynous reproductive pattern, as observed in other lethrinids. Gonad histology indicated non-functional protogynous hermaphroditism for L. atkinsoni and L. nebulosus. The diversity of life histories among these closely related species emphasizes the difficulty in devising single management strategies appropriate for multi-species fisheries and illustrates the importance of understanding species-specific life histories to infer responses to exploitation.

Item ID: 23251
Item Type: Article (Refereed Research - C1)
Keywords: exploitation; life history; reef fishes; reproductive biology; tropical fisheries
ISSN: 1095-8649
Funders: CRC Reef Research Center, Great Barrier Reef Marine Park Authority, Fisheries Research and Development Corporation, Queensland Department of Primary Industries and Fisheries, James Cook University
Date Deposited: 03 Sep 2012 01:40
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070402 Aquatic Ecosystem Studies and Stock Assessment @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830204 Wild Caught Fin Fish (excl. Tuna) @ 100%
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