Reproductive demography of a temperate protogynous and herbivorous fish, Odax pullus (Labridae, Odacini)

Trip, E.D.L., Raubenheimer, D., Clements, K.D., and Choat, J.H. (2011) Reproductive demography of a temperate protogynous and herbivorous fish, Odax pullus (Labridae, Odacini). Marine and Freshwater Research, 62 (2). pp. 176-186.

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Abstract

A common view is that, in marine fishes, herbivory and sex change are subject to physiological constraints at high latitudes, which are likely to affect growth rates and reproductive outputs. The present study examines the reproductive demography of Odax pullus, an herbivorous and protogynous species of temperate New Zealand. We establish an otolith-based methodology for age estimation and investigate sex-specific growth, longevity and age-based reproductive events. Individuals achieved a maximum age of 11 years, reached 85% of adult body size (455 mm FL) within the first 3.5 years of life, were sexually mature by the age of 1.1–1.5 years and changed sex at 2.8–3.5 years, indicating fast simultaneous somatic and reproductive growth. There was no significant difference in growth or body size between the sexes. Ovary weight of spawning females increased significantly with size and age, suggesting the presence of size- and age-fecundity skews underlying the absence of sex change in larger and older females. Testes of reproductively active males comprised less than 1% of bodyweight, suggesting pair-spawning and little sperm competition. The present study provides metrics to support comparisons of the demography of this temperate protogynous and herbivorous labrid across spatial or temporal strata.

Item ID: 20199
Item Type: Article (Refereed Research - C1)
Keywords: butterfish, edge type analysis, mating system, oxytetracycline, relative gonad weight, reparameterised von Bertalanffy growth function, size- and age-at-maturity, size- and age-at-sex change
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ISSN: 1448-6059
Date Deposited: 29 Feb 2012 06:29
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070403 Fisheries Management @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830299 Fisheries- Wild Caught not elsewhere classified @ 100%
Citation Count from Web of Science Web of Science 2
Downloads: Total: 1
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