European hake (
            <i>Merluccius merluccius</i>
            ) in the Northeast Atlantic Ocean

Korta, María; García, Dorleta; Santurtún, Marina; Goikoetxea, Nerea; Andonegi, Eider; Murua, Hilário; Álvarez, Paula; Cerviño, Santiago; Castro, J.J.; Murillas, Arantza

doi:10.1002/9781118568262.ch1

Cited by 12 publications

(21 citation statements)

References 76 publications

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“…This suitable bathymetric range is slightly different to the one found in the same area (90–180 m) by Sánchez and Gil (). Similar results have been reported by other authors for the Bay of Biscay (Korta et al., ), as well as in Mediterranean areas (Maynou, Lleonart, & Cartes, ; Paradinas et al., ).…”

Section: Discussionsupporting

confidence: 91%

“…Despite the European hake commercial relevance and the studies perfomed (Alvarez, ; Bartolino, Ottavi, Colloca, Ardizzone, & Stefansson, ; Kacher & Amara, ; Sánchez & Gil, ), many aspects of its life history, population dynamics and ecology are still poorly known, particularly in the juvenile fraction (Murua, ). In addition, during this early phase of the life‐cycle, individuals are densely concentrated in nursery grounds on muddy beds on the continental shelf, making them susceptible to bottom trawl fisheries (Korta et al., ).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, during this early phase of the life-cycle, individuals are densely concentrated in nursery grounds on muddy beds on the continental shelf, making them susceptible to bottom trawl fisheries (Korta et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Balancing resource protection and fishing activity: The case of the European hake in the northern Iberian Peninsula

Pennino

Vilela

Velasco

2018

Fisheries Oceanography

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One of the fundamental aims of the Ecosystem Approach to Fisheries Management is to ensure the long‐term sustainability of the fishery by protecting key life‐cycle habitats, such as recruitment areas. In this study, we apply a hurdle Bayesian hierarchical spatio‐temporal model that describes the abundance of European hake (Merluccius merluccius) recruits in the northern continental shelf of the Iberian Peninsula. Our findings clearly show four persistent nurseries, the main one being located along the continental shelf of the Artabrian gulf (off La Coruña). The preferential habitats identified for the hake recruits are areas within a bathymetric range of 120–200 m, with 15–16°C of Sea Surface Temperature, a Chl‐a concentration of 0.8–1.2 mg/m3 and low values of seabed rugosity (unconsolidated substrates). Searching for a compromise with fisheries, we also assess the degree of overlap of the main nursery areas with two fisheries footprints, a local one using Vessel Monitoring System data of trawl fishery of Marín, and a global one using Automatic Identification System data of different type of trawlers (bottom otter, beam and midwater trawls). The two fisheries footprints present different degree of overlapping in distinct areas, highlight the need of specific fleet‐adapted management rules in order to protect juvenile stages. We discuss that understanding the distributional patterns associated with key life stages, such as recruitment, and their interaction with fishing activities, is essential for applying appropriate spatial management measures and improving fishery sustainability.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Balancing resource protection and fishing activity: The case of the European hake in the northern Iberian Peninsula

Pennino

Vilela

Velasco

2018

Fisheries Oceanography

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“…The availability of relevant tagging data could have allowed to release this strong assumption and test more complex migration design. This simple pattern of migration contrasts with some literature (Alvarez et al, 2004;Baudron and Fernandes, 2015;Casey and Pereiro, 1995;Guichet, 1996;Korta et al, 2015), which discussed potential movements between the Bay of Biscay and the Celtic Sea, even if no data supports this statement. This also contradicts Bertignac et al (2012) model, which estimates a 60% migration to the Celtic Sea, and a 25% migration to the Bay of Biscay.…”

Section: Perception Of the Fishery And Stock Dynamics Supported By Thcontrasting

confidence: 99%

“…Given to the literature, there are several potential migrations of the stock between the three areas (Table 3). Several studies (Alvarez et al, 2004;Baudron and Fernandes, 2015;Casey and Pereiro, 1995;Guichet, 1996;Korta et al, 2015) indicate that some seasonal migrations may occur between the Bay of Biscay and the Celtic Sea, on the one hand, and between the West of Scotland and the North Sea on the other hand, linked to both spawning and environmental conditions. Based on those studies, we considered migration from the Bay of Biscay to the Celtic Sea at the end of winter and in the opposite direction in the other seasons.…”

Section: Towards a Spatial Assessment Modelmentioning

confidence: 99%

Towards a spatial integrated stock assessment model for European hake northern stock

2018

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European hake (Merluccius merluccius) is a key species in the management of several mixed fisheries in the northeast Atlantic where regional spatial management plans are being set up. The wide spatial distribution of hake and the lack of knowledge of some processes involved in its spatial dynamics could hamper the assessment and management of hake. To help understand the processes, we implemented a spatial version of the Stock Synthesis stock assessment model for northern hake, including available data on this stock and the associated fisheries. For the 1978-2012 time series, the model distinguished the Bay of Biscay, the Celtic Sea and a northern area aggregating the West of Scotland and the North Sea. The model considered an agestructured population for each age class and area, a seasonal migration, global recruitment allocated to areas and fishing fleets for each area. Parameters for stock and exploitation spatio-temporal dynamics were estimated by likelihood maximization for each quarter and area. The comparison of spatial and non spatial models goodness of fit showed they were close, although the fit to abundance indices slightly improved with the spatial model. Fishing mortalities, spawning stock biomasses and recruitments were slightly different from the current assessment model estimates, essentially at the beginning and the end of the time series. On average over the time series, fishing mortality estimates relative to the abundance were higher in the Bay of Biscay than elsewhere, spawning stock biomass estimates were higher in the Celtic Sea than elsewhere, and recruitment occurred mainly in the Bay of Biscay. Finally, the final spatial model estimated a strong movement from the northern area to the Celtic Sea. The final spatial model is a step towards a spatial assessment and management of the stock.

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