Geostatistical tools to assess shifts in recreational fishing
Shannon J. Burchert
A * , Glenn A. Hyndes A , Karina L. Ryan B and Ute Mueller A
+ Author Affiliations
- Author Affiliations
A School of Science, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, Australia.
B Department of Primary Industries and Regional Development, Northside Drive, Hillarys, WA 6025, Australia.
Marine and Freshwater Research 73(5) 588-604 https://doi.org/10.1071/MF21131
Submitted: 7 May 2021 Accepted: 13 December 2021 Published: 9 February 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-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
The use of geostatistical indices to examine fishery-dependent data over time is novel. We assess the value of a range of these indices for describing trends in boat-based recreational fishing in Western Australia and areas of high effort and catches for two demersal species with varying biological characteristics, life histories and distributions. The number of blocks (10- × 10-nautical mile (~19- × 19-km) area) visited decreased by 40%, while the number of fishing trips with demersal species catch increased by 15%. Spatial indices showed a south-easterly shift in demersal catch per unit effort (CPUE) across survey years. The southerly shift of West Australian dhufish (Glaucosoma herbraicum) CPUE and subsequent return to the north likely to reflect the response of this temperate species to a marine heatwave. In comparison, CPUE of retained Baldchin groper (Choerodon rubescens) shifted north, whereas released catches shifted south with high probabilities of hotspots present associated with habitat structure. We identified hotspots of retained and released CPUE, highlighting potential areas where species experience high post-release mortality through barotrauma, and targeted spatial management strategies. Spatial indices allow quantitative definition of the structure of the fishery, identify high catch areas, and assess changes over time at a broader scale to sustainably manage multispecies fisheries.
Keywords: angling, catch rate, centre of gravity, fisheries management, fishery-dependent data, geostatistics, hotspot, index of collocation.
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