Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off Brazil

Since the early 2000s, codling, hake and blackfin goosefish became main components in the landings of double-rig and stern trawlers fishing in the slope off the south and southeast coasts of Brazil. Because these stocks are known to be little resilient, the heterogeneous and unpredictable fishing re...

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Autores principales:	Dias,Martin Coachman, Perez,José Angel Alvarez
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2016
Materias:	fishing strategy multiple strategies fleets deep-water fishery target métier analysis
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2016000500016
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spelling	oai:scielo:S0718-560X20160005000162016-12-15Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off BrazilDias,Martin CoachmanPerez,José Angel Alvarez fishing strategy multiple strategies fleets deep-water fishery target métier analysis Since the early 2000s, codling, hake and blackfin goosefish became main components in the landings of double-rig and stern trawlers fishing in the slope off the south and southeast coasts of Brazil. Because these stocks are known to be little resilient, the heterogeneous and unpredictable fishing regime has been regarded as biologically and ecologically unsafe. In this article, we examine the fishing strategies developed by the Brazilian trawl fleet when fishing deep water fish between 2007 and 2009. Slope fish resources were primarily exploited under four fishing tactics. On Tactic 1 landings comprised mainly hake and blackfin goosefish, with trawlers concentrating their fishing effort on the fishing grounds located in the upper slope (300350 m depth) in central and northern areas. Two other strategies (Tactics 3 and 4) were similar to each other, with trawlers occupying fishing grounds on the upper slope (350 m) along the whole area. Catches were dominated by codling, representing at least 50% of the fish landed. A fourth strategy (Tactic 2) concentrated in shallow fishing grounds (100 m) along the whole coast, reported only small landings of deep water species (less than 20%). We characterized five different fleets based on the number of fishing trips that vessels dedicated to each strategy. During the study period, 34-37 vessels have undertaken fishing trips primarily in slope fishing grounds, however a few vessels (10-14) also fished for coastal species (Tactic 2). From 11 to 22 vessels fished regularly as coastal trawlers, operating opportunistically on slope grounds. Management of the deep water trawl fishery should take into consideration the number of trawlers specialized in targeting deep-water resources and the behaviour of opportunistic trawlers occasionally fishing in the slope.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.44 n.5 20162016-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2016000500016en10.3856/vol44-issue5-fulltext-16
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	fishing strategy multiple strategies fleets deep-water fishery target métier analysis
spellingShingle	fishing strategy multiple strategies fleets deep-water fishery target métier analysis Dias,Martin Coachman Perez,José Angel Alvarez Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off Brazil
description	Since the early 2000s, codling, hake and blackfin goosefish became main components in the landings of double-rig and stern trawlers fishing in the slope off the south and southeast coasts of Brazil. Because these stocks are known to be little resilient, the heterogeneous and unpredictable fishing regime has been regarded as biologically and ecologically unsafe. In this article, we examine the fishing strategies developed by the Brazilian trawl fleet when fishing deep water fish between 2007 and 2009. Slope fish resources were primarily exploited under four fishing tactics. On Tactic 1 landings comprised mainly hake and blackfin goosefish, with trawlers concentrating their fishing effort on the fishing grounds located in the upper slope (300350 m depth) in central and northern areas. Two other strategies (Tactics 3 and 4) were similar to each other, with trawlers occupying fishing grounds on the upper slope (350 m) along the whole area. Catches were dominated by codling, representing at least 50% of the fish landed. A fourth strategy (Tactic 2) concentrated in shallow fishing grounds (100 m) along the whole coast, reported only small landings of deep water species (less than 20%). We characterized five different fleets based on the number of fishing trips that vessels dedicated to each strategy. During the study period, 34-37 vessels have undertaken fishing trips primarily in slope fishing grounds, however a few vessels (10-14) also fished for coastal species (Tactic 2). From 11 to 22 vessels fished regularly as coastal trawlers, operating opportunistically on slope grounds. Management of the deep water trawl fishery should take into consideration the number of trawlers specialized in targeting deep-water resources and the behaviour of opportunistic trawlers occasionally fishing in the slope.
author	Dias,Martin Coachman Perez,José Angel Alvarez
author_facet	Dias,Martin Coachman Perez,José Angel Alvarez
author_sort	Dias,Martin Coachman
title	Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off Brazil
title_short	Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off Brazil
title_full	Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off Brazil
title_fullStr	Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off Brazil
title_full_unstemmed	Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off Brazil
title_sort	multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off brazil
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2016000500016
work_keys_str_mv	AT diasmartincoachman multiplestrategiesdevelopedbybottomtrawlerstoexploitfishingresourcesindeepareasoffbrazil AT perezjoseangelalvarez multiplestrategiesdevelopedbybottomtrawlerstoexploitfishingresourcesindeepareasoffbrazil
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Multiple strategies developed by bottom trawlers to exploit fishing resources in deep areas off Brazil

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