137701 - Modelling the spatial distribution of Patagonian toothfish (Dissostichus eleginoides) by length and age.pdf (2.49 MB)
Modelling the spatial distribution of Patagonian toothfish (Dissostichus eleginoides) by length and age around Heard Island and McDonald Islands on the Kerguelen Plateau
conference contribution
posted on 2023-05-23, 14:30 authored by Farmer, B, Nowara, GB, Thomas BarnesThomas Barnes, Paul BurchPaul Burch, Woodcock, E, Ziegler, P, Welsford, DOver 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.
History
Publication title
The Kerguelen Plateau: marine ecosystem and fisheries. Proceedings of the Second SymposiumEditors
DC Welsford, J Dell and G DuhamelPagination
219-235ISBN
9781876934309Department/School
Institute for Marine and Antarctic StudiesPublisher
Australian Antarctic DivisionPlace of publication
Kingston, TasmaniaEvent title
The Kerguelen Plateau: marine ecosystem and fisheriesEvent Venue
AustraliaDate of Event (Start Date)
2017-11-13Date of Event (End Date)
2017-11-14Rights statement
Copyright unknownRepository Status
- Open