Characterization of discards along a wide bathymetric range from a trawl fishery in the NW Mediterranean

Blanco, Marta; Nos, David; Lombarte, Antoni; Recasens, Laura; Company, Joan B.; Galimany, Eve

doi:10.1016/j.fishres.2022.106552

Cited by 15 publications

(7 citation statements)

References 38 publications

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“…Notably, the discard ratio, in terms of weight, within the Catalan trawling fleet ranges from 12% to 26% in the upper slope (Blanco et al, 2023). Thus, the networks of spatial closures we presented could have greater conservation benefits than the ones estimated herein.…”

Section: Discussionmentioning

confidence: 77%

“…Moreover, the designation of spatial closures can have significant positive impacts not only on the target commercial species but also on reducing the unintended catch and discards of non‐target species within the fishery (Hilborn et al., 2004; Johnsen & Eliasen, 2011). Notably, the discard ratio, in terms of weight, within the Catalan trawling fleet ranges from 12% to 26% in the upper slope (Blanco et al., 2023). Thus, the networks of spatial closures we presented could have greater conservation benefits than the ones estimated herein.…”

Section: Discussionmentioning

confidence: 99%

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Dynamic marine spatial planning for conservation and fisheries benefits

Vigo,

Hermoso,

Navarro

et al. 2024

Fish and Fisheries

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The increasing global demand for marine resources raises concerns about sustainable resource management and biodiversity conservation. Spatial closures, such as marine protected areas, can be valuable tools for maintaining and restoring exploited populations. When these spatial closures adopt a dynamic nature being adapted to the changing environment, they can effectively account for factors such as shifting species distributions, which enhances their potential to achieve ecological and socio‐economic objectives. Here, we adapted a decision‐support tool (the software Marxan), typically used for selecting static and permanent areas, to produce management recommendations that integrate permanent and temporal closures to fisheries. Our aim was to compare the outputs of a static network of permanent no‐take reserves with four other dynamic scenarios, including permanent and temporal closures that account for seasonal variations in the populations of species. All scenarios prioritized sites for the conservation of one of the most valuable European fishing stocks, the Norway lobster (Nephrops norvegicus). Additionally, we considered 12 other commercially exploited species captured by the Norway lobster fishery. The assessed outputs included retained biomass, area extent, closure type (permanent and seasonal) and opportunity costs within each scenario. We observed that all dynamic scenarios required fewer management areas permanently closed than the static scenario. This resulted in a lower opportunity cost for fisheries but also a higher capacity for biodiversity conservation. Therefore, complementing permanent with temporal closures could enhance biodiversity conservation and fisheries management. The novel dynamic planning method presented here could be applicable to other species, ecosystems and socio‐economic contexts.

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Dynamic marine spatial planning for conservation and fisheries benefits

Vigo,

Hermoso,

Navarro

et al. 2024

Fish and Fisheries

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“…However, although a similar pattern was expected for marine demersal prey, only available for surface feeder seabirds through trawling discards [ 61 , 62 ], here we found that during the lockdown, demersal prey group was an important food item for yellow-legged gulls. Specifically, the bogue, the main demersal prey identified during all the years analysed and considered one of the most discarded species by the trawling fleet in the western Mediterranean [ 45 ], was the only demersal prey identified in the stomachs during the lockdown period. Although bogue is present in Mediterranean deep waters up to 350 m, it is a species that can also be found close to the sea surface in shallow waters [ 63 ], where gulls are able to capture them.…”

Section: Discussionmentioning

confidence: 99%

“…A significant activity is conducted in the fishing harbour of Barcelona and close coastal cities, with almost 3500 tons of fish caught every year [ 44 ]. This activity generates a large amount of fishing discards [ 45 ], being an important feeding resource for the yellow-legged gulls in this and other breeding areas [ 13 , 38 , 39 ]. In addition to marine prey, abundant urban birds such as rock pigeon and monk parakeet have been identified as key prey for this species [ 13 , 21 ].…”

Section: Methodsmentioning

confidence: 99%

Changes in the feeding ecology of an opportunistic predator inhabiting urban environments in response to COVID-19 lockdown

et al. 2023

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Urban-dwelling species present feeding and behavioural innovation that enable them to adjust to anthropogenic food subsidies available in cities. In 2020, the SARS-CoV-2 virus outbreak resulted in unprecedented reduction in the human activity worldwide associated with the human lockdown. This situation opened an excellent opportunity to investigate the capability of urban wildlife to cope with this anthropopause event. Here, we investigated the effects of the COVID-19 lockdown on the feeding strategies of the urban yellow-legged gull ( Larus michahellis ) population inhabiting the highly dense city of Barcelona (NE Spain). We compared the diet of chicks (through stomach content and stable isotope analyses) sampled randomly around the city of Barcelona before (2018 and 2019), during (2020) and after (2021) the COVID-19 lockdown. The results revealed that the anthropopause associated with the lockdown had an effect on the diet of this urban-dwelling predator. The diversity of prey consumed during the lockdown was lower, and consumption of urban birds (pigeons and parakeets) and marine prey (fishery discards and natural prey) decreased during the year of lockdown. Although it was not analysed, these diet changes probably were associated with variations in the availability of these resources due to the decrease in human activity during the lockdown. These results demonstrate the trophic flexibility of urban-dwelling species to cope with the changes in the availability of human-related anthropogenic resources in urban marine ecosystems.

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“…Onboard sampling data contain information from daily onboard catches performed at three different depths, one haul at each depth, following the recommendations described in Blanco et al. 2023 ( 12 ). For each haul, and briefly, the catch is identified at species level and measured.…”

Section: Methodsmentioning

confidence: 99%

Fisheries data management systems in the NW Mediterranean: from data collection to web visualization

Ribera-Altimir,

Llorach-Tó,

Sala-Coromina

et al. 2023

Database

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The European Union Data Collection Framework (DCF) states that scientific data-driven assessments are essential to achieve sustainable fisheries. To respond to the DCF call, this study introduces the information systems developed and used by Institut Català de Recerca per a la Governança del Mar (ICATMAR), the Catalan Institute of Research for the Governance of the Seas. The information systems include data from a biological monitoring, curation, processing, analysis, publication and web visualization for bottom trawl fisheries. Over the 4 years of collected data (2019–2022), the sampling program developed a dataset of over 1.1 million sampled individuals accounting for 24.6 tons of catch. The sampling data are ingested into a database through a data input website ensuring data management control and quality. The standardized metrics are automatically calculated and the data are published in the web visualizer, combined with fishing landings and Vessel Monitoring System (VMS) records. As the combination of remote sensing data with fisheries monitoring offers new approaches for ecosystem assessment, the collected fisheries data are also visualized in combination with georeferenced seabed habitats from the European Marine Observation and Data Network (EMODnet), climate and sea conditions from Copernicus Monitoring Environment Marine Service (CMEMS) on the web browser. Three public web-based products have been developed in the visualizer: geolocated bottom trawl samplings, biomass distribution per port or season and length-frequency charts per species. These information systems aim to fulfil the gaps in the scientific community, administration and civil society to access high-quality data for fisheries management, following the Findable, Accessible, Interoperable, Reusable (FAIR) principles, enabling scientific knowledge transfer. Database URL https://icatmar.github.io/VISAP/(www.icatmar.cat)

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Characterization of discards along a wide bathymetric range from a trawl fishery in the NW Mediterranean

Cited by 15 publications

References 38 publications

Dynamic marine spatial planning for conservation and fisheries benefits

Dynamic marine spatial planning for conservation and fisheries benefits

Changes in the feeding ecology of an opportunistic predator inhabiting urban environments in response to COVID-19 lockdown

Fisheries data management systems in the NW Mediterranean: from data collection to web visualization

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