Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery

Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery

In response to claims that conventional Nordmøre-grids used in the Clarence River penaeid-trawl fishery were occasionally being fouled or blocked during fishing, two experiments were done to examine the utility of modified grids with different installation angles, sizes and profiles, and alternative...

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Autores principales: Broadhurst, MK, Young, DJ, Damiano, C
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2004
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/111
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id oai:cienciasmarinas.com.mx:article-111
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Broadhurst, MK
Young, DJ
Damiano, C
spellingShingle Broadhurst, MK
Young, DJ
Damiano, C
Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery
author_facet Broadhurst, MK
Young, DJ
Damiano, C
author_sort Broadhurst, MK
title Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery
title_short Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery
title_full Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery
title_fullStr Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery
title_full_unstemmed Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery
title_sort effects of nordmøre-grid angles, profiles and other industry-developed modifications on catches in an australian penaeid-trawl fishery
description In response to claims that conventional Nordmøre-grids used in the Clarence River penaeid-trawl fishery were occasionally being fouled or blocked during fishing, two experiments were done to examine the utility of modified grids with different installation angles, sizes and profiles, and alternative industry-developed, behavioral-type bycatch reduction devices (BRDs). In experiment 1, a conventional Nordmøre-grid (600 mm in length, installed at 45º) was compared against a longer grid (1200 mm in length, installed at 21º) and two locally-developed, behavioral-type BRDs. While slightly more difficult to operate than the conventional design, the longer Nordmøre-grid retained similar quantities of penaeids and bycatch; in contrast, both behavioraltype BRDs retained significantly (up to five times) more bycatch and were considered ineffective for use in this fishery. In experiment 2, the conventional Nordmøre-grid was tested against three modified Nordmøre-grids, including a 600-mm-long grid with a curved profile and installed at 45º, and two grids, both 900 mm in length and installed at 28º, but with flat and curved profiles. Only the curved 900-mm Nordmøre-grid caught significantly fewer penaeids and bycatch, although both of the curvedprofile grids appeared to facilitate the release of debris from the trawl. The results are discussed in terms of fishery-specific factors that probably contributed towards the performances of the various BRDs.
publisher Iniversidad Autónoma de Baja California
publishDate 2004
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/111
_version_ 1715723923114426368
spelling oai:cienciasmarinas.com.mx:article-1112019-04-12T18:09:20Z Effects of Nordmøre-grid angles, profiles and other industry-developed modifications on catches in an Australian penaeid-trawl fishery Efectos de ángulos y perfiles de las rejillas Nordmøre, y otras modificaciones desarrolladas por la industria, sobre las capturas de una pesquería australiana de peneidos Broadhurst, MK Young, DJ Damiano, C bycatch reduction shrimp prawn selectivity Nordmøre-grid reducción de la fauna acompañante camarón langostino selectividad rejilla Nordmøre In response to claims that conventional Nordmøre-grids used in the Clarence River penaeid-trawl fishery were occasionally being fouled or blocked during fishing, two experiments were done to examine the utility of modified grids with different installation angles, sizes and profiles, and alternative industry-developed, behavioral-type bycatch reduction devices (BRDs). In experiment 1, a conventional Nordmøre-grid (600 mm in length, installed at 45º) was compared against a longer grid (1200 mm in length, installed at 21º) and two locally-developed, behavioral-type BRDs. While slightly more difficult to operate than the conventional design, the longer Nordmøre-grid retained similar quantities of penaeids and bycatch; in contrast, both behavioraltype BRDs retained significantly (up to five times) more bycatch and were considered ineffective for use in this fishery. In experiment 2, the conventional Nordmøre-grid was tested against three modified Nordmøre-grids, including a 600-mm-long grid with a curved profile and installed at 45º, and two grids, both 900 mm in length and installed at 28º, but with flat and curved profiles. Only the curved 900-mm Nordmøre-grid caught significantly fewer penaeids and bycatch, although both of the curvedprofile grids appeared to facilitate the release of debris from the trawl. The results are discussed in terms of fishery-specific factors that probably contributed towards the performances of the various BRDs. En respuesta al reclamo de que las rejillas Nordmøre convencionales usadas en la pesquería de peneidos en el Río Clarence (NSW, Australia) se obstruían o bloqueaban durante las operaciones de pesca, se llevaron a cabo dos experimentos para examinar la eficacia de rejillas modificadas (con diferentes ángulos de instalación, tamaños y perfiles) y de dispositivos de tipo conductual para la reducción de la fauna acompañante desarrollados por la industria. En el experimento 1, se comparó una rejilla Nordmøre convencional (600 mm de longitud, instalada a 45º) con una rejilla Nordmøre más larga (1200 mm de longitud, instalada a 21º) y con dos dispositivos conductuales desarrollados localmente. Aunque ligeramente más difícil de operar que la rejilla Nordmøre convencional, la rejilla más larga retuvo cantidades similares de peneidos y fauna acompañante; sin embargo, los dos dispositivos conductuales retuvieron considerablemente más fauna acompañante (hasta cinco veces más), por lo que fueron considerados ineficaces para este tipo de pesquería. En el experimento 2, se comparó la rejilla Nordmøre convencional con tres rejillas Nordmøre modificadas: la primera de 600 mm de longitud con perfil curvo e instalada a 45º, y las otras dos de 900 mm de longitud e instaladas a 28º, pero una con perfil plano y la otra con perfil curvo. Sólo la rejilla Nordmøre de 900 mm y perfil curvo capturó significativamente menos peneidos y fauna acompañante; no obstante, ambas rejillas con perfil curvo parecían facilitar la descarga de basura de la red de arrastre. Se discuten los resultados considerando factores específicos de la pesquería que probablemente influyeron en el comportamiento de los diversos dispositivos utilizados. Iniversidad Autónoma de Baja California 2004-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/111 10.7773/cm.v30i12.111 Ciencias Marinas; Vol. 30 No. 1B (2004); 155-168 Ciencias Marinas; Vol. 30 Núm. 1B (2004); 155-168 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/111/91

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