Paper| Year: | 2022 |
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| Author(s): | V. Moltó, I.A. Catalán, A. Ospina-Álvarez, P. Hernández, R.H. Roa-Ureta |
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| Title: | A multiannual five-fleet generalized depletion model for the stock assessment of the Mediterranean dolphinfish (Coryphaena hippurus) fishery |
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| Journal: | ICES JOURNAL OF MARINE SCIENCE |
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| ISSN: | 1054-3139 |
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| Pages: | 1-16 |
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| D.O.I.: | 10.1093/icesjms/fsac072 |
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| Web: | |
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| Abstract: | 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. |
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Related staffAndrés Alonso Ospina AlvarezIgnacio A. Catalán AlemanyRelated departmentsMarine EcologyRelated projectsCo-Trip CTA 058
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