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Modelling the spatial distribution of Patagonian toothfish (Dissostichus eleginoides) by length and age around Heard Island and McDonald Islands on the Kerguelen Plateau

Citation

Farmer, B and Nowara, GB and Barnes, TC and Burch, P and Woodcock, E and Ziegler, P and Welsford, D, Modelling the spatial distribution of Patagonian toothfish (Dissostichus eleginoides) by length and age around Heard Island and McDonald Islands on the Kerguelen Plateau, The Kerguelen Plateau: marine ecosystem and fisheries. Proceedings of the Second Symposium, 13-14 November 2017, Australia, pp. 219-235. ISBN 9781876934309 (2019) [Refereed Conference Paper]


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Official URL: http://heardisland.antarctica.gov.au/research/kerg...

Abstract

Over 27 000 fish caught around Heard Island and McDonald Islands (HIMI) on the Kerguelen Plateau have been aged from sectioned otoliths in the Australian ageing program since 1999, comprising more than 47 000 individual reads from seven different readers. Extensive length and age data for Patagonian toothfish (Dissostichus eleginoides) in particular can be used for large-scale spatial analyses across this region. In this paper we present spatial models of median toothfish length and age across the Australian exclusive economic zone (EEZ) at HIMI. Both models revealed strong patterns in the spatial distribution of toothfish, particularly in the concentration of smaller and younger fish on the shallower parts of the plateau (<500 m), and the occurrence of fish with increasing size and age in deeper water. These spatial analyses will aid in the further refinement of hypotheses regarding the habitat use and movement of different life history stages of toothfish in order to support appropriate management strategies for the species.

Item Details

Item Type:Refereed Conference Paper
Keywords:modelling, age structure, Patagonian toothfish, Dissostichus eleginoides, Heard Island and McDonald Islands, Kerguelen Plateau, spatial distribution, ageing
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Aboriginal and Torres Strait Islander Environmental Knowledge
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management at Regional or Larger Scales
UTAS Author:Farmer, B (Mr Bryn Farmer)
UTAS Author:Barnes, TC (Dr Thomas Barnes)
UTAS Author:Burch, P (Dr Paul Burch)
UTAS Author:Woodcock, E (Miss Emma Woodcock)
ID Code:137701
Year Published:2019
Deposited By:Fisheries and Aquaculture
Deposited On:2020-02-27
Last Modified:2020-04-07
Downloads:0

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