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Age-based life history of humpback red snapper, Lutjanus gibbus, in New Caledonia

Citation

Moore, BR, Age-based life history of humpback red snapper, Lutjanus gibbus, in New Caledonia, Journal of Fish Biology, 95, (6) pp. 1374-1384. ISSN 0022-1112 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 The Fisheries Society of the British Isles

DOI: doi:10.1111/jfb.14142

Abstract

This paper examines the life history of humpback red snapper Lutjanus gibbus , an important fishery species for coastal communities across the Indo‐Pacific, in southern New Caledonia, where the species is lightly exploited. A total of 243 L. gibbus were sampled between January 2013 and December 2016 from occasional harvests of commercial fishers. Examination of sectioned otoliths revealed that opaque increment formation occurred annually between November and March, coinciding with the species' spawning season. Estimates of maximum age were similar between sexes, with observed ages of 38 and 36 years for females and males, respectively, extending the reported longevity of this species by at least 11 years. Growth differed significantly between sexes, with males reaching greater length at age and greater asymptotic length than females (38.88 v . 31.46 cm fork length (L F). Total mortality for all samples was estimated as 0.13 and was slightly higher for males (0.16) than females (0.11). Estimates of natural and fishing mortality were low and slightly higher for males than females. Male L. gibbus were found to mature at slightly greater lengths and younger ages than females, with the length and age at which 50% of individuals attained maturity estimated to be 25.8 cm L F and 3.9 years of age for females and 26.8 cm L F and 3.4 years of age for males. The results provide key baseline information from which to assess the effect of fishing on the species for populations in New Caledonia and adjacent locations and, when viewed with those of other studies, highlight the importance of understanding spatial patterns in demography of harvested fish species across gradients of exploitation and environmental influences.

Item Details

Item Type:Refereed Article
Keywords:age, demography, growth, Lutjanidae, mortality, reproduction
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fish physiology and genetics
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Fisheries - wild caught not elsewhere classified
UTAS Author:Moore, BR (Dr Bradley Moore)
ID Code:139515
Year Published:2019
Web of Science® Times Cited:1
Deposited By:Fisheries and Aquaculture
Deposited On:2020-06-18
Last Modified:2020-08-11
Downloads:0

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