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Biology and ecology of Zearaja maugeana, an endangered skate restricted to two south-western Tasmanian estuaries

Citation

Treloar, MA and Barrett, NS and Edgar, GJ, Biology and ecology of Zearaja maugeana, an endangered skate restricted to two south-western Tasmanian estuaries, Marine and Freshwater Research, 68, (5) pp. 821-830. ISSN 1323-1650 (2017) [Refereed Article]

Copyright Statement

Journal compilation copyright CSIRO 2017

Official URL: https://doi.org/

DOI: doi:10.1071/MF15478

Abstract

The Endangered Maugean skate Zearaja maugeana is a relic species restricted to two isolated estuaries, Bathurst Harbour and Macquarie Harbour, in south-western Tasmania, Australia. Over a 1-year period, dive, tagging and net surveys provided information on the biology and ecology of this species. In all, 96 Maugean skates were caught during five trips to Macquarie Harbour, with four additional individuals observed underwater; however, no animals were located in the single trip to Bathurst Harbour. Morphometrics and the sex of the animals were recorded for 95 individuals. Crustaceans dominated the diet, with the majority of animals feeding on the crab Paragrapus gaimardii. Recapture rates were very low, with only one of 82 pit-tagged skates recaptured, and that occurred on the day of release. One acoustically tagged male skate was tracked for 5 km along the harbour margin for 24 h, whereas a female skate tracked for 46.5 h showed high site fidelity, suggesting that multiple factors potentially influence habitat utilisation. Although Macquarie Harbour represents the stronghold for this species, this estuary is also experiencing major environmental disturbance and change. Conservation management of this Endangered skate requires specific consideration of aquaculture, recreational fishing and mine drainage effects, as well as ongoing monitoring.

Item Details

Item Type:Refereed Article
Keywords:skate, population biology, threatened species, movement, conservation, diet, elasmobranch, fishing impact, fish tagging, movement, reproductive biology
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Treloar, MA (Dr Michelle Treloar)
Author:Barrett, NS (Associate Professor Neville Barrett)
Author:Edgar, GJ (Professor Graham Edgar)
ID Code:120486
Year Published:2017
Funding Support:Australian Research Council (LP150100761)
Web of Science® Times Cited:1
Deposited By:Ecology and Biodiversity
Deposited On:2017-08-25
Last Modified:2018-07-30
Downloads:0

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