Technical note: Specifications for the construction and installation of two by-catch reducing devices (BRDs) used in New South Wales prawn-trawl fisheries

Broadhurst, Matt K.; Kennelly, Steven J.; O'Doherty, Gillian M.

doi:10.1071/mf97049

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…2d). The area of the small panel grid matched the assumed fishing circumference of the extension section, similar to the designs tested by Broadhurst et al ( , 1997. Two 90-mm ∅ polystyrene buoys were attached to each side of the grid, near the escape exit (Table 1; Fig.…”

Section: Nordmøre-grids and Codendsmentioning

confidence: 98%

“…All of the grids had 24-mm spaces between their bars ; chosen based on the morphology of the targeted sizes of X. kroyeri (see Section 3) and similar relationships for Australian penaeidtrawl fisheries (Broadhurst et al, , 1997. The first design (termed the 'small panel grid') was made from hollow aluminium rod (19-and 16-mm ∅ for the frame and bars, respectively) and measured 342 mm × 550 mm (Table 1; Fig.…”

Section: Nordmøre-grids and Codendsmentioning

confidence: 99%

“…2). All of the extension sections and guiding panels were made from polyamide mesh (PA) and measured 2.4 and 1.8 m in length (see Broadhurst et al, 1997 for general installation details). The extension sections had maximum stretched and assumed fishing circumferences of 3.8 and approximately 1.3 m (i.e.…”

Section: Nordmøre-grids and Codendsmentioning

confidence: 99%

See 2 more Smart Citations

Refining a Nordmøre-grid for a Brazilian artisanal penaeid-trawl fishery

Silva¹,

Broadhurst²,

Schwingel³

et al. 2011

Fisheries Research

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Section: Nordmøre-grids and Codendsmentioning

confidence: 98%

Section: Nordmøre-grids and Codendsmentioning

confidence: 99%

See 1 more Smart Citation

Refining a Nordmøre-grid for a Brazilian artisanal penaeid-trawl fishery

Silva¹,

Broadhurst²,

Schwingel³

et al. 2011

Fisheries Research

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“…1A). The extensions were made of identical 41 mm mesh (3.0 mm diameter braided black twine), measured with 150 meshes in a transversal direction (T) and 95 and 110 meshes in a normal direction (N), respectively, and had guiding panels following the specifications provided by Broadhurst et al (1997) (Fig. 1A).…”

Section: Methodsmentioning

confidence: 99%

Mitigating the bycatch of giant cuttlefish Sepia apama and blue swimmer crabs Portunus armatus in an Australian penaeid-trawl fishery

Kennelly¹,

Broadhurst²

2014

Endang. Species. Res.

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Trawlers in Spencer Gulf, Australia, target western king prawns Melicertus latisulcatus, with nearly all other species discarded; two of the latter have evoked significant, although quite different, concerns. The first is the giant cuttlefish Sepia apama, which has undergone a drastic decline in numbers in Spencer Gulf in recent years, and is listed as 'Near Threatened' by the International Union for the Conservation of Nature. S. apama are susceptible to trawling during their annual spawning migration through Spencer Gulf. The other bycatch problem involves large quantities of blue swimmer crabs Portunus armatus, which currently are separated inside the trawl using a large-meshed liner. Due to the additional handling required and the physical damage caused by the crabs' exoskeletons on the soft-bodied M. latisulcatus and Sepia spp., P. armatus would ideally be able to escape of their own accord during towing. This study examined the utility of mechanical-separating bycatch reduction devices (BRDs) for reducing unwanted bycatches of Sepia spp. and P. armatus. We compared (against conventional codends) the smallest and largest practical sizes of Nordmøre-grids (the latter to maximise sorting area), with correspondingly large and low grid angles. The large Nordmøre-grid significantly reduced Sepia spp., P. armatus and total bycatch (by 33−50%), but had no effect on catches of M. latisulcatus. Whilst additional research is required, a modified Nordmøre-grid should help to resolve the bycatch of P. armatus and S. apama in this fishery, with minimal commercial impacts.

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“…Although the areas are linked physically, each one has its own ichthyofaunistic identity. The introduction of equipments such as bycatch reduction devices (BROADHURST, KENNELLY & O'DOHERTY, 1997;ROGERS et al, 1997) or the adaptation of the current fishing gears (HANNAH & JONES, 2000) should therefore be enforced in the region.…”

Section: Resultsmentioning

confidence: 99%

Ictiofauna demersal numa região de plataforma continental do sul do Brasil submetida à pesca camaroeira

Chaves¹,

Cova-Grando²,

Calluf³

2003

ABPar

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Ictiofauna demersal numa região de Plataforma Continental do Sul do Brasil, submetida à pesca camaroeira. A ictiofauna de uma região de Plataforma Continental do litoral do Paraná foi analisada objetivando comparar os atributos das espécies cujos indivíduos estão submetidos à pesca camaroeira com arrasto de fundo (profundidade 10m), com aqueles das espécies cujos indivíduos situam-se em área adjacente, sem atividade pesqueira (profundidade 15m). O material foi coletado através de arrasto de fundo, em 1999 e 2000, analisando-se sua composição, abundância e atividade reprodutiva. Entre as sessenta e duas espécies de peixes, 30 foram comuns às duas áreas, 24 exclusivas da área 10m e oito exclusivas da área 15m. A pesca camaroeira e seu conseqüente bycatch ocorrem numa área de Plataforma onde os atributos da ictiofauna são diferentes daqueles da área próxima. Incluem maior número de espécies exclusivas, maiores efetivos numéricos, maior atividade reprodutiva e espécies mais apreciadas para consumo. Os grupos cujos indivíduos são de bom valor comercial quando adultos (Clupeiformes e Sciaenidae) têm abundâncias mais regulares ao longo do tempo na área 10m que na área 15m; nesta, grupos sem interesse comercial (Haemulidae, Tetraodontiformes) predominam. Conclui-se que a assembléia de peixes da área 15m, onde pesca não é realizada, não dispõe de atributos biológicos (composição, atividade reprodutiva e outros) que pudessem neutralizar os efeitos impactantes causados pelo bycatch da pesca camaroeira na área adjacente. ABSTRACT A region of the Continental Shelf of Southern Brazil, isobaths 10 and 15 meters, was studied aiming to compare the attributes of the fish assemblage exposed to the shrimp trawl fisheries, to those of a fish assemblage from a contiguous deeper area that is not exposed to this fishing modality. Individuals were collected with bottom trawl net along 1999 and 2000, and its composition, abundance, size and reproductive activity were analyzed. Of the sixtytwo fish species, 30 were common to both areas, while 24 were exclusive to the fishing area and eight were exclusive to the nonfishing area. The shrimp trawl fisheries and the bycatch associated to it occur in a shelf area having very distinctive ichthyofaunistic attributes when compared to those found in the area where this type of fishing does not occur. These attributes include a high number of species exclusive to the fishing area, the formation of larger populational aggregates, a higher intensity of reproductive activity, a larger permanence of species with potential economic value, and a smaller mean individual size. There is evidence that many species do not reside in the study region, but are present because of their migratory behavior. Species whose individuals are valued commercially when adults (mainly Clupeiformes and Sciaenidae) present more uniform abundance values through time in the fishing area than in the contiguous area, where many important groups with no commercial interest (Haemulidae, Tetraodontiformes) were recorded. It is estimated that the ichthyofauna of the area presenting shrimp trawl fisheries is exposed to a disturbance that cannot be counterbalanced by the absence of this fishery activity in its contiguous area. RÉSUMÉ Ichtyofaune démersale dans une région du plateau continental sud-brésilien soumise à la pêche aux crévettes. Lichtyofaune dune région du plateau continental sud-brésilien a été analisée envisageant la comparaison entre les attributs de lassemblage soumis à la pêche chalutière aux crévettes, profondeur 10m, et ceux de lassemblage dune aire adjacente, profondeur 15m, où il ny a pas ce type de pêche. Le matériel a été prélevé en utilisant le chalut de fond, années 1999 et 2000, et leur composition, abondance et activité reproductive ont été évaluées. Parmi les soissante-deux espèces de poissons, 30 ont été communes aux deux aires, 24 ont été exclusives de laire 10m, et huit de laire 15m. La pêche aux crevettes et son conséquent bycatch de poissons ont lieu dans une aire du plateau portant des attributs ichtyofaunistiques différents de ceux de laire voisine, surtout des valeurs plus importantes despèces exclusives, deffectif numérique, dactivité reproductive et despèces ayant un interêt commercial. Les espèces ayant une bonne valeur commerciale quand les individus sont adultes (Clupeiformes et Sciaenidae) ont des abondances plus régulières au cours du temps à 10m quà 15m, où quelques groups sans interêt commercial (Haemulidae, Tetraodontiformes) sont plus abondants. Il est proposé que labsence de pêche au chalut dans laire 15m ne peut pas réduire les impacts que cette activité cause dans son aire voisine.

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Technical note: Specifications for the construction and installation of two by-catch reducing devices (BRDs) used in New South Wales prawn-trawl fisheries

Cited by 8 publications

References 5 publications

Refining a Nordmøre-grid for a Brazilian artisanal penaeid-trawl fishery

Refining a Nordmøre-grid for a Brazilian artisanal penaeid-trawl fishery

Mitigating the bycatch of giant cuttlefish Sepia apama and blue swimmer crabs Portunus armatus in an Australian penaeid-trawl fishery

Ictiofauna demersal numa região de plataforma continental do sul do Brasil submetida à pesca camaroeira

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