Patrón reproductivo y fecundidad de la merluza (&lt;i&gt;Merluccius merluccius&lt;/i&gt; (Linnaeus, 1758)) en el Mediterráneo occidental

Recasens, Laura; Chiericoni, Velia; Belcari, Paola

doi:10.3989/scimar.2008.72n4721

Cited by 46 publications

(13 citation statements)

References 17 publications

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“…The discarding behaviour of the Blanes trawler fleet is related to the biology of some species regulated by MCRS. The period of greatest reproductive activity of many Mediterranean commercial fish species, such as Merluccius merluccius, Mullus barbatus, Mullus surmuletus, Pagellus bogaraveo, Pagellus erythrinus and Trachurus trachurus, occurs between late spring and late autumn (Recasens et al 2008, Tsikliras et al 2014, Carbonara et al 2015, and there was a significant increase in fishing effort in autumn and winter at several of the continental shelf fishing grounds studied, corresponding with the season of recruitment of these animals. This was the case for Garotes, where the fishing effort increased from September to April and discarding increased significantly in March for Mullus barbatus, Pagellus erythrinus and Pagellus bogaraveo (Fig.…”

Section: Discussionmentioning

confidence: 95%

Linking trawl fleet dynamics and the spatial distribution of exploited species can help to avoid unwanted catches: the case of the NW Mediterranean fishing grounds

et al. 2018

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With the full implementation of the landing obligation on 1 January 2019, In European waters it will become mandatory for the trawling fleet to land at port all catches of certain species because, according to Article 15 of the new European Common Fisheries Policy, the species subject to the minimum conservation reference size (MCRS) cannot be discarded. Additionally, since 2005, trawlers over 15 m in length are required to carry an onboard vessel monitoring system (VMS), which generates information on fleet dynamics. The objective of this work was to provide a tool for avoiding unwanted catches by integrating the catch study of trawlers operating in the port of Blanes together with VMS data. To achieve this objective, the catches of 40 hauls were monitored, sampled and analysed together with VMS data for the years 2012-2014 integrated in a geographical information system. The results show that specimens below the MCRS were often captured in crinoid aggregation habitats, bottoms with maërl and muddy bottoms that were identified as nursery habitats of commercial species, e.g. Merluccius merluccius, Pagellus spp. and Mullus spp. VMS data showed considerable fishing pressure on areas with maërl and muddy habitats during the recruitment periods of these and other commercially relevant species. Implementing spatial or seasonal closures in habitats where species regulated by the MCRS are subject to catches could be a useful tool for preventing unwanted catches.

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Section: Discussionmentioning

confidence: 95%

Linking trawl fleet dynamics and the spatial distribution of exploited species can help to avoid unwanted catches: the case of the NW Mediterranean fishing grounds

et al. 2018

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“…According to El Habouz et al (2011), the largest diameter of eggs in ripening hake females barely exceeds one mm, whereas the batch fecundity ranges from around forty thousand to almost one million eggs (average around three hundred thousand) for the smaller and larger mature females, respectively. Recasens et al (2008) gave estimations of batch fecundity for hake of between 17296 eggs for a female of 35 cm TL and 681489 for a female of 66 cm TL.…”

Section: Discussionmentioning

confidence: 99%

A new approach to recruitment overfishing diagnosis based on fish condition from survey data

et al. 2020

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A new approach to recruitment overfishing diagnosis is presented. We hypothesize that condition of recruits should increase when recruitment failures are caused by fishing activity. This would be a consequence of the increase in trophic resource availability, because the population is smaller than that which the ecosystem could support. Temporal series of hake recruit condition were calculated from MEDITS survey data collected in Mediterranean geographical sub-areas (GSAs) 1, 6, 17 and 19 from 1994 to 2015. Multiple linear regressions were used to analyse the relationship between mean annual condition and abundance of recruits and climatic indices in each GSA. Significant correlations were only detected in GSA 6, where 69% of condition variability was explained by the negative correlation with recruit abundance, and with two climatic indices, the Western Mediterranean Oscillation and the standardized air temperature anomaly at surface from the Gulf of Lions. Despite the differences in recruit abundance among GSAs, their mean annual condition oscillated around the same basal value during most of the time series, pointing to density-dependent mortality rates as an important mechanism stabilizing hake recruitment to levels close to the carrying capacity when populations do not suffer recruitment overfishing. This pattern changed when the decreasing recruit abundance trend drove GSA 6 condition values persistently above those of the rest of the GSAs. According to our hypothesis, hake in GSA 6 is in recruitment overfishing.

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“…These fecundity coefficients refer to the number of European hake eggs and larvae that survive and become recruits. Knowing the number of eggs per female of mature European hake (Recasens et al 2008), we need to know the daily mortality rates of the eggs of the species to define the number of survivors corresponding to the recruits.…”

Section: Recruitment Submodelmentioning

confidence: 99%

“…First, based on the observations of European hake individuals in MEDITS (2012-2013) and in the commercial fishing data, we calculated the number of eggs per individual through the equation of Recasens et al (2008):…”

Section: Recruitment Submodelmentioning

confidence: 99%

Spatial management of the European hake <em>Merluccius merluccius</em> fishery in the Catalan Mediterranean: Simulation of management alternatives with the InVEST model

Khoukh

Maynou

2018

Sci. Mar.

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European hake (Merluccius merluccius) is an important commercial fisheries species that shows growth overfishing, with catches basically focused on juveniles. This study assesses the benefit of closing a coastal area (an essential habitat for European hake recruits) to fishing, in addition to other alternatives of spatial management, compared with traditional, non–spatial management scenarios on fishing grounds exploited by the bottom trawl fleets of Blanes and Palamós (Province of Girona, NE Spain). We use InVEST, a spatially explicit model of intermediate complexity that simulates the bioeconomic effects of management measures for decision making. The sensitivity analysis of the model results shows the high influence of some parameters, particularly the parameterization of the recruitment submodel and European hake’s fecundity coefficients. The results are also examined in the light of uncertainty on migration parameters: in the two cases analysed (considering migration patterns or not), the results of the indicators (catch and revenues, abundance, recruitment and spawning stock biomass) were qualitatively similar and all show that the application of a restricted fishing area in one particular fishing ground (Vol de Terra) is the best management alternative. Its bioeconomic effects are comparable to a reduction of fishing effort of up to 20%. With high levels of ontogenetic migration, fishing on a second fishing ground (Cul de Rec – El Pas) should be restricted to enhance the biomass of the European hake population.

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Patrón reproductivo y fecundidad de la merluza (<i>Merluccius merluccius</i> (Linnaeus, 1758)) en el Mediterráneo occidental

Cited by 46 publications

References 17 publications

Linking trawl fleet dynamics and the spatial distribution of exploited species can help to avoid unwanted catches: the case of the NW Mediterranean fishing grounds

Linking trawl fleet dynamics and the spatial distribution of exploited species can help to avoid unwanted catches: the case of the NW Mediterranean fishing grounds

A new approach to recruitment overfishing diagnosis based on fish condition from survey data

Spatial management of the European hake <em>Merluccius merluccius</em> fishery in the Catalan Mediterranean: Simulation of management alternatives with the InVEST model

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