Estimation of the spawning stock and recruitment relationship of Octopus vulgaris in Asturias (Bay of Biscay) with generalized depletion models : implications for the applicability of MSY

Roa-Ureta, Rubén H. and Fernández-Rueda, M del Pino and Acuña, José Luis and Rivera, Antonella and González-Gil, Ricardo and García-Flórez, Lucía (2021) Estimation of the spawning stock and recruitment relationship of Octopus vulgaris in Asturias (Bay of Biscay) with generalized depletion models : implications for the applicability of MSY. ICES Journal of Marine Science, 78 (6). pp. 2256-2270. ISSN 1054-3139 (https://doi.org/10.1093/icesjms/fsab113)

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Abstract

We developed a new type of generalized depletion model adapted to the rapid life cycle of Octopus vulgaris and the data collection framework put in place in its co-managed small-scale fishery (SSF) in Asturias, northwest Spain. The model uses weekly data from 19 seasons to estimate annual recruitment and female spawners emigration out of the vulnerable stock to attend to their broods. The matched annual spawners-recruitment (SR) magnitudes are then used as observations in a non-Bayesian hierarchical inference framework. The Shepherd SR model was selected among three alternatives. The stock has a high degree of density-dependence, leading to overcompensation. The estimated SR model has an unstable equilibrium point, driving the stock to deterministic cyclic fluctuations under small disturbances. Under those conditions the maximum sustainable yield (MSY) is not applicable, lending further credence to Sidney Holt’s opposition to the MSY as a basis for the elaboration of fishery management objectives, with potentially wide relevance to the management of SSF and cephalopod fisheries. We argue that harvest rates based on mean latent productivity, a concept that includes the MSY as a special case, are more adequate and sustainable for fluctuating stocks.

  • Item type:Article
    ID code:76853
    Dates:
    Date
    Event
    30 September 2021
    Published
    15 June 2021
    Published Online
    24 May 2021
    Accepted
    Subjects:Agriculture > Aquaculture. Fisheries. Angling
    Department:UNSPECIFIED
    Depositing user: Pure Administrator
    Date deposited:22 Jun 2021 10:26
    Last modified:11 Nov 2024 13:08
    URI:https://strathprints.strath.ac.uk/id/eprint/76853
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