Life-history characteristics of the eastern shovelnose ray, Aptychotrema rostrata (Shaw, 1794), from southern Queensland, Australia
Matthew J. Campbell
A B C , Mark F. McLennan A , Anthony J. Courtney A and Colin A. Simpfendorfer B
+ Author Affiliations
- Author Affiliations
A Queensland Department of Agriculture and Fisheries, Agri-Science Queensland, Ecosciences Precinct, GPO Box 267, Brisbane, Qld 4001, Australia.
B Centre for Sustainable Tropical Fisheries and Aquaculture and College of Science and Engineering, James Cook University, 1 James Cook Drive, Townsville, Qld 4811, Australia.
C Corresponding author. Email: matthew.campbell@daf.qld.gov.au
Marine and Freshwater Research 72(9) 1280-1289 https://doi.org/10.1071/MF20347
Submitted: 4 December 2020 Accepted: 26 March 2021 Published: 7 May 2021
Journal Compilation © CSIRO 2021 Open Access CC BY ©The State of Queensland (through the Department of Agriculture and Fisheries Queensland) [2021] and The Authors 2021
Abstract
The eastern shovelnose ray (Aptychotrema rostrata) is a medium-sized coastal batoid endemic to the eastern coast of Australia. It is the most common elasmobranch incidentally caught in the Queensland east coast otter trawl fishery, Australia’s largest penaeid-trawl fishery. Despite this, age and growth studies on this species are lacking. The present study estimated the growth parameters and age-at-maturity for A. rostrata on the basis of sampling conducted in southern Queensland, Australia. This study showed that A. rostrata exhibits slow growth and late maturity, which are common life-history strategies among elasmobranchs. Length-at-age data were analysed within a Bayesian framework and the von Bertalanffy growth function (VBGF) best described these data. The growth parameters were estimated as L0 = 193 mm TL, k = 0.08 year–1 and L∞ = 924 mm TL. Age-at-maturity was found to be 13.3 years and 10.0 years for females and males respectively. The under-sampling of larger, older individuals was overcome by using informative priors, reducing bias in the growth and maturity estimates. As such, the results can be used to derive estimates of natural mortality for this species.
Keywords: life history, growth, age-at-maturity, elasmobranch, Aptychotrema rostrata.
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