A multiannual five-fleet generalized depletion model for the stock assessment of the Mediterranean dolphinfish (Coryphaena hippurus) fishery

Autor: Vicenç Moltó, Ignacio A Catalán, Andrés Ospina-Álvarez, Pilar Hernández, Rubén H Roa-Ureta
Přispěvatelé: Food and Agriculture Organization of the United Nations, Ministerio de Agricultura, Pesca y Alimentación (España), European Commission, Govern de les Illes Balears
Rok vydání: 2022
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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ISSN: 1095-9289
1054-3139
DOI: 10.1093/icesjms/fsac072
Popis: Generalized depletion models have proven useful to provide management information for data-limited fisheries. These models are suitable for stocks with fast depletion and recruitment inputs that reset the depletion. The Mediterranean common dolphinfish (Coryphaena hippurus) fishery shows these dynamics, being seasonally exploited mainly by fish aggregation devices in small-scale fisheries from four countries and as bycatch by longline fisheries. These fleets operate on separate fishing grounds, and with distinct effort–catch dynamics. This led to the development of a multiannual five-fleet generalized depletion model applicable to a monthly database of effort, catch, and mean weight from 2008 to 2019. Results showed a high natural mortality rate (0.25 month−1) and wide intra-season fluctuations in biomass. Annual recruitment fluctuates around 10 million individuals, and it has been stable along the analysed period. Exploitation rate only exceeded 40% during the peak month of catches, being much lower the rest of the season, indicating that this stock is fished within sustainable limits. We provide here the first estimation of reference points for the management of the shared dolphinfish Mediterranean stock and show that generalized depletion models can be extended to complex fisheries with multiple fleets with different effort–catch dynamics.
This work was partially funded by two FAO projects: CopeMed phase II “Coordination to Support Fisheries Management in the Western and Central Mediterranean” and MedSudMed “Assessment and Monitoring of the Fishery Resources and the Ecosystems in the Straits of Sicily,” (http://www.faocopemed.org/, https://www.faomedsudmed.org/) both co-funded by the Spanish and Italian Ministries of Agriculture, Fishery and Food, and by the Directorate-General for Maritime Affairs and Fisheries of the European Commission (DG-MARE). FAO provided further funding to develop the mathematical-statistical model and the software to apply it under a contract to RHR-U. We thank Marcelo Vasconcellos, Luca Ceriola, and Enrico Arneri for their coordination efforts. Antoni M. Grau, Adriano Mariani, Miriam Gambin, Amina Besbes Benseddik, and Raouf Besbes for their provision of fish aggregation device fleet data in the different countries as well as the Tunas Group from the Oceanographic Center of Málaga, especially to DM and SG-B, for providing data from the longline fleet onboard observers program. AO was supported by a contract financed through the call for postdoctoral fellowships of the Government of the Balearic Islands, program “Vicenç Mut” 2020.
Databáze: OpenAIRE
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