Relative efficiency of square mesh codends in an artisanal

Silva, Catarina N. S.; Dias, José H.; Cattani, André Pereira; Spach, Henry Louis

doi:10.3856/vol40-issue1-fulltext-12

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…Different codend constructions with square meshes have been shown to have good selective properties for finfish and are applied in many fisheries [17, 18]. These types of construction are not widespread in shrimp fisheries, but several studies have successfully applied square mesh panels/codends in shrimp trawl fisheries [19, 20, 21]. Therefore, testing codend constructions that incorporate square mesh size selectivity and comparing them to the 35-mm diamond mesh codends used by the fleet today is relevant.…”

Section: Introductionmentioning

confidence: 99%

Quantification of bell-shaped size selectivity in shrimp trawl fisheries using square mesh panels and a sorting cone after a Nordmøre grid

et al. 2019

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Shrimp trawlers in the Barents Sea use a Nordmøre sorting grid ahead of a small-mesh codend to avoid bycatch while catching shrimps efficiently. However, small fish can still pass through the grid to enter the codend, which increases their risk of being retained. In this study, we quantified the selectivity of a standard Nordmøre grid used together with one of two different codend designs, namely a diamond mesh codend with square mesh panels and a codend with a square mesh sorting cone section, for deep-water shrimp (Pandalus borealis), redfish (Sebastes spp.), and American plaice (Hippoglossoides platessoides). For the first time, the selective properties of these two alternative designs were estimated and compared to those of a Nordmøre grid used together with a 35-mm diamond mesh codend, which is the compulsory gear used in the fishery today. With this traditional codend, the size selectivity of both bycatch species showed the expected characteristic bell-shaped size selection pattern, with low retention probability of very small fish and bigger fish but with high retention probability of certain sizes of juveniles. Using the square mesh sorting cone significantly reduced the maximum retention risk of redfish. The maximum retention with the diamond mesh codend with square mesh panels was estimated to be 14% lower than that of the traditional codend, but the difference was not statistically significant. The two alternative codend designs did not result in any significant reduction in bycatch of American plaice.

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Section: Introductionmentioning

confidence: 99%

Quantification of bell-shaped size selectivity in shrimp trawl fisheries using square mesh panels and a sorting cone after a Nordmøre grid

et al. 2019

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“…These activities are mainly performed through double rig bottom trawl nets, a common fishing practice in this area, where an interaction with different species is recognized. Some of these species are commercially used by the fleet and some others are discarded (Haimovici & Mendonça, 1996;Andriguetto-Filho et al, 2009;Silva et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Industrial double rig trawl fisheries in the southeastern and southern Brazil: characterization of the fleet, nets and trawl simulation

Queirolo

Wahrlich

Molina

et al. 2016

lajar

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ABSTRACT. The industrial double rig trawl fisheries are an important extractive activity in the southeastern and southern Brazil where near 300 vessels participate, targeting their catch to the sea-bob shrimp, pink shrimp and demersal fishes, such as flatfishes and monkfish. In order to advance in the fishery management, a general characterization of the trawl fleet operating in the area was done, identifying the patterns of nets used and the hydrodynamic performance of the nets observed by means of dynamic simulation. 194 vessels of Santa Catarina State and 130 vessels from other areas, mainly built in steel and wood, were identified. The largest size, tonnage, and capacity, correspond to those vessels working upon demersal and oceanic fishes. On the other hand, the most abundant vessels were those working upon pink shrimp (230 vessels). Regarding the nets, different patterns were identified according to the catch of target species; the smaller nets were used to catch shrimps (sea-bob and pink shrimp) and the largest were used to catch fishes. Mixed nets were also identified, characterized by similar dimensions of nets to catch fish but with mesh sizes of shrimp nets. From the simulations, different performance functions were adjusted according to each founded pattern; these functions will serve to calculate net's spread, their shape relationship, and the hydrodynamic drag forces. Key words: sea-bob shrimp, pink shrimp, demersal fishes, double rig trawl, dynamic simulation, Brazil.Pesquerías industriales de arrastre con tangones en el sudeste y sur de Brasil: caracterización de la flota, redes y simulación dinámica RESUMEN. Las pesquerías industriales de arrastre con tangones son una importante actividad extractiva en el sudeste y sur de Brasil donde participan cerca de 300 embarcaciones dirigiendo su captura a camarón siete barbas, camarón rosa, y peces demersales como peces planos y pejesapo. Para avanzar en el manejo pesquero, se realizó una caracterización general de la flota de arrastre que opera en el área, identificando los patrones de las redes usadas y el desempeño hidrodinámico de las redes observado mediante simulación dinámica. Se analizaron 194 embarcaciones del Estado de Santa Catarina y 130 embarcaciones de otras áreas, construidas principalmente de acero y madera. Las embarcaciones de mayor tamaño, tonelaje y capacidad correspondieron a aquellas que trabajan sobre peces demersales y peces oceánicos. La mayor cantidad de embarcaciones opera sobre camarón rosa (230 embarcaciones). Respecto a las redes, se identificaron diferentes patrones de acuerdo a las especies objetivo de captura; las redes más pequeñas fueron usadas para la captura de camarones (camarón siete barbas y camarón rosa) y las de mayor tamaño para la captura de peces. También se identificaron redes mixtas, caracterizadas por dimensiones similares a las redes para capturar peces pero con tamaño de malla de redes camaroneras. A partir de las simulaciones se ajustaron diferentes funciones de desempeño conforme a los patrones particula...

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“…A eficiência relativa da malha quadrada foi testada por SILVA et al, 2012 (2) em relação à malha diamante, não havendo diferenças significativas entre elas tanto para a captura do camarão quanto para o descarte. Ainda assim, reduziram em média a quantidade de fauna acompanhante, havendo também perdas em peso de camarão sete-barbas (SILVA et al, 2012b). Os experimentos, por sua vez, foram realizados com redes de tamanhos de malha maiores, para embarcações do litoral do Paraná de dimensões menores que as frotas de Governador Celso Ramos (SILVA et al, 2012 (2) A fisiografia montanhosa da região da APAA dificulta o acesso, sendo um obstáculo ao escoamento da produção.…”

Section: Dias-netounclassified

“…No país, recomendações para o uso de BRDs vêm sendo apresentadas em propostas de planos de gestão, mas sua efetivação depende da realização de pesquisas, ainda incipientes no Brasil (PEREZ et al, 2001;DIAS NETO, 2011;GUANAIS et al, 2015). Informações limitadas sobre a eficiência dos BRDs ressaltam a importância de abordagens participativas de pesquisa e gestão SILVA et al, 2011;SILVA et al, 2012a;SILVA et al, 2012b;MEDEIROS et al, 2013;GUANAIS et al, 2015). Permanece a necessidade de estratégias efetivas no Brasil, integradas à dinâmica local (MEDEIROS et al, 2013).…”

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Modificações estruturais nas redes de arrasto de camarão: percepção dos pescadores e implicações para a gestão em uma área marinha protegida

Portella

Medeiros

2016

Bol. Inst. Pesca

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RESUMOO artigo compreende uma análise das percepções dos pescadores sobre adotar modificações estruturais para a redução do bycatch (BRD) numa Área Marinha Protegida (AMP) do sul do Brasil. A coleta de dados incluiu arrastos demonstrativos com pescadores de média escala (acima de 45HP), oficinas devolutivas e entrevistas sobre a dinâmica da pesca e eficiência dos BRDs. As oficinas devolutivas compreenderam uma análise participativa do desempenho do BRD e possibilidades e obstáculos para a sua adoção. Pescadores concordaram com os resultados do BRD, bem como a continuidade de pesquisa para melhorar a redução de juvenis na fauna acompanhante. Percepções negativas da redução do bycatch comercializável afetaram a aceitação e são desafios à gestão pesqueira. Contudo, a abordagem participativa estimulou iniciativas colaborativas para melhorar a gestão, a aprendizagem institucional e o engajamento dos pescadores para pesca artesanal responsável. A experiência analisada pode servir de piloto para pesquisas futuras e gestão em outras AMPs. Palavras-chave: cogestão; enfoque ecossistêmico; dispositivos redutores-BRD; fauna acompanhante; Santa Catarina-Brasil ABSTRACTThis paper comprises an analysis on fisher's perceptions about using bycatch modification devices (BRD) as fishery management tools in a south Brazilian Marine Protected Area. Data collection included demonstration hauls with medium-sized trawling fishers (over 45HP), workshops and interviews about perceptions on fishery dynamics and BRD efficiency. Workshops encompassed a participatory analysis on BRDs' performance and potential and constraints for adopting them. Fishers agreed on BRD performance results as well as to continue research and knowledge sharing to improve juvenile fishes and shrimp in bycatch. Otherwise, negative perceptions on reducing bycatch for sale and consumption were considered constraints and challenged fisheries management strategies. Despite perceived constraints, participatory approach was a conduit for using BRD as "triggers" for continued collaboration to improve fishery management performance, to foster institutional learning and fisher's engagement to promote responsible small-scale fisheries. Experience can work as pilot site for future research and management in other MPA.

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Relative efficiency of square mesh codends in an artisanal

Cited by 12 publications

References 16 publications

Quantification of bell-shaped size selectivity in shrimp trawl fisheries using square mesh panels and a sorting cone after a Nordmøre grid

Quantification of bell-shaped size selectivity in shrimp trawl fisheries using square mesh panels and a sorting cone after a Nordmøre grid

Industrial double rig trawl fisheries in the southeastern and southern Brazil: characterization of the fleet, nets and trawl simulation

Modificações estruturais nas redes de arrasto de camarão: percepção dos pescadores e implicações para a gestão em uma área marinha protegida

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