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Assessing changes in size at maturity for the European hake (Merluccius merluccius) in Atlantic Iberian waters

  • Davinia Lojo [2] ; Marta Cousido-Rocha [1] ; Santiago Cerviño [1] ; Rosario Dominguez-Petit [1] ; María Sainza [1] ; Maria Grazia Pennino [1]
    1. [1] Instituto Español de Oceanografía

      Instituto Español de Oceanografía

      Madrid, España

    2. [2] Centro Tecnológico del Mar-Fundación CETMAR
  • Localización: Scientia Marina, ISSN 0214-8358, Vol. 86, Nº. 4, 2022
  • Idioma: inglés
  • DOI: 10.3989/scimar.05287.046
  • Títulos paralelos:
    • Reproducción del pargo gris (Teleostei: Lutjanidae) en el sur del Golfo de México
  • Enlaces
  • Resumen
    • español

      La merluza europea (Merluccius merluccius) es un recurso comercialmente importante en aguas Atlánticas Ibé-ricas. A pesar del plan de recuperación puesto en marcha en 2006 y del plan de gestión plurianual de las aguas occidentales, la mortalidad por pesca sigue siendo superior a la correspondiente al rendimiento máximo sostenible de la población de merluza del sur de Europa. Comprender los procesos biológicos que subyacen a la dinámica de este stock y proporcionar información sobre los rasgos de la historia de vida es fundamental para evaluar la productividad y la resiliencia de la po-blación, convirtiéndolos en información básica para la gestión. Analizamos la variabilidad temporal de la talla de madurez (L50) y los principales factores que influyen en ella, desde 1982 hasta 2019 en aguas Atlánticas Ibéricas. La variabilidad anual de L50 para cada sexo se modeló con Modelos Aditivos Generalizados considerando variables ambientales explicati-vas (Oscilación Multidecadal del Atlántico, Oscilación del Atlántico Norte y Temperatura Superficial del Mar), y variables biológicas (biomasa, biomasa reproductora por talla y factor de condición relativo). Los resultados mostraron que la de los machos disminuyó en un total de 12,9 cm y la L50 de las hembras disminuyó en un total de 10,9 cm de 1982 a 2019. Para las hembras las variables explicativas significativas fueron año, biomasa de desove por talla, biomasa y NAO, mientras que para los machos solo el año. Estos resultados son importantes para comprender el estado de la población de merluza europea, lo que destaca que la L50 es un buen indicador para predecir la dinámica futura de la población.

    • English

      European hake (Merluccius merluccius) is a commercially important resource in Iberian Atlantic waters. De-spite the recovery plan implemented in 2006 and the multiannual management plan for western waters, fishing mortality is still higher than that corresponding to the maximum sustainable yield for the southern European hake stock. The biological processes underlying the dynamics of this stock and its life history traits are essential for assessing population productivity and resilience, making them basic information for management. We analysed the temporal variability of size at maturity (L50) of this species and the main factors influencing it in Atlantic Iberian waters from 1982 to 2019. The annual variability of L50 for each sex was modelled with generalized additive models, considering explanatory environmental variables (At-lantic Multidecadal Oscillation, North Atlantic Oscillation and sea surface temperature) and biological variables (biomass, spawning biomass at length and relative condition factor). The results showed that the L50of males decreased by a total of 12.9 cm and L50of females decreased by a total of 10.9 cm from 1982 to 2019. For females the significant explanatory variables were year, spawning biomass at length, biomass and the North Atlantic Oscillation, while for males only year was an explanatory variable. These results are important for understanding the status of the European hake population, signalling that L50 is a good indicator for predicting future population dynamics.

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