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RESEARCH ARTICLE (Open Access)

Cross-jurisdictional larval supply essential for eastern Australian spanner crabs (Ranina ranina)

Hayden T. Schilling https://orcid.org/0000-0002-7291-347X A B C * , Daniel E. Hewitt https://orcid.org/0000-0003-3119-9254 B , Neil Malan https://orcid.org/0000-0001-7568-3908 B , Matthew D. Taylor https://orcid.org/0000-0002-1519-9521 B C and Daniel D. Johnson https://orcid.org/0000-0003-3119-5560 C
+ Author Affiliations
- Author Affiliations

A Sydney Institute of Marine Science, Chowder Bay Road, Mosman, NSW 2088, Australia.

B Centre for Marine Science and Innovation, UNSW Sydney, Sydney, NSW 2052, Australia.

C Port Stephens Fisheries Institute, New South Wales Department of Primary Industries, Locked Bag 1, Nelson Bay, NSW 2315, Australia.

* Correspondence to: hayden.schilling@dpi.nsw.gov.au

Handling Editor: Jill Chiu

Marine and Freshwater Research 73(11) 1352-1367 https://doi.org/10.1071/MF21348
Submitted: 10 December 2021  Accepted: 15 August 2022   Published: 9 September 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC)

Abstract

Context: The spanner crab (Ranina ranina) stock of eastern Australia is distributed across two state jurisdictions and, as a non-migratory species with a pelagic larval phase, connectivity within this stock is likely to occur by larval dispersal, driven by ocean currents.

Aims: To understand connectivity and patterns of larval supply in the eastern Australian spanner crab stock.

Methods: Lagrangian particle tracking methods were used to simulate larval transport around the key spanner crab fishing regions in eastern Australia.

Key results: Spawning off central Queensland (Qld) supplies a large proportion of recruits, supporting both the Qld and New South Wales (NSW) fisheries. Lagged larval settlement showed significant correlations to catch-per-unit-effort and the proportion of total harvest taken within the NSW fishery, providing evidence to suggest that the NSW fishery may be reliant on spawning activity in Queensland.

Conclusions: The Qld and NSW fisheries are highly connected and the broad-scale patterns identified by the current modelling approach could provide an indicator of potentially good or bad recruitment years, particularly as finer resolution, and refined reproductive biology knowledge on spanner crabs becomes available.

Implications: The Qld and NSW fisheries are highly connected with a source–sink structure and it is recommended that a co-management strategy be adopted.

Keywords: connectivity, East Australian Current, Lagrangian, larval subsidy, modelling, particle tracking, pelagic larval duration, temperature dependent growth.


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