Journal
FISHERIES MANAGEMENT AND ECOLOGY
Volume 29, Issue 1, Pages 16-28Publisher
WILEY
DOI: 10.1111/fme.12514
Keywords
catch-only models; coastal stocks; ensemble models; freshwater stocks; mixed-use fisheries; stock status
Categories
Funding
- European Maritime Fisheries Fund (EMFF) of the EU
- State of Mecklenburg-Vorpommern (Germany) [B 730117000069, MV-I.18-LM-004]
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This study demonstrates the potential of using catch-only models to assess the status of previously unassessed coastal and freshwater stocks facing recreational fishing pressure. By studying a northern pike stock as a case study, it was found to be fully exploited and currently declining, highlighting the importance of incorporating recreational removals for reliable insights into the status of mixed-use stocks.
Information on catch and effort of recreational angling in mixed-use fisheries (co-exploited by commercial and recreational fishers) is often scarce, preventing the application of data-rich stock assessments typically performed for industrialised commercial fisheries. This study shows how data-poor stock assessment methods developed for marine fisheries, particularly a model class labelled as catch-only models (COMs), offer a possible solution. As a case study, COMs are used to assess a northern pike Esox lucius L. stock around the German Baltic island of Rugen. Multiple COMs were fitted to a time series of total pike removals, and their outputs were used as explanatory variables in ensemble models. The stock was found to be fully exploited and currently declining. This study highlights the potential for using COMs to determine status of previously unassessed coastal and freshwater stocks facing recreational fishing pressure and demonstrates how incorporating recreational removals is crucial for achieving reliable insights into the status of mixed-use stocks.
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