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Reproductive demography of a temperate protogynous and herbivorous fish, Odax pullus (Labridae, Odacini)
Trip, E.D.L.; Raubenheimer, D.; Clements, K.D.; Choat, J.H. (2011). Reproductive demography of a temperate protogynous and herbivorous fish, Odax pullus (Labridae, Odacini). Mar. Freshw. Res. 62(2): 176-186. https://hdl.handle.net/10.1071/MF10238
In: Marine and Freshwater Research. CSIRO: East Melbourne. ISSN 1323-1650; e-ISSN 1448-6059, meer
Peer reviewed article  

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Trefwoorden
    Groei; Grootte; Herbivorous fish; Leeftijd; Mating; Maturation; Labridae Cuvier, 1816 [WoRMS]; Odax pullus (Forster, 1801) [WoRMS]; Marien
Author keywords
    butterfish; edge type analysis; mating system; oxytetracycline; relativegonad weight; reparameterised von Bertalanffy growth function; size- andage-at-maturity; size- and age-at-sex change

Auteurs  Top 
  • Trip, E.D.L.
  • Raubenheimer, D.
  • Clements, K.D.
  • Choat, J.H.

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.

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