Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf

The piked dogfish Squalus acanthias is part of the bycatch of several South American longline fisheries, although in Argentina, it was only reported in the bycatch of benthic and demersal fisheries operating bottom nets. This communication represents the first record of S. acanthias bycatch in a com...

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Autores principales:	Seco Pon,Juan P, Gandini,Patricia A
Lenguaje:	English
Publicado:	Escuela de Ciencias del Mar. Pontificia Universidad Católica de Valparaíso 2007
Materias:	piked dogfish bycatch semi-pelagic longline Patagonian Shelf
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-71782007000100007
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spelling	oai:scielo:S0717-717820070001000072007-06-15Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian ShelfSeco Pon,Juan PGandini,Patricia A piked dogfish bycatch semi-pelagic longline Patagonian Shelf The piked dogfish Squalus acanthias is part of the bycatch of several South American longline fisheries, although in Argentina, it was only reported in the bycatch of benthic and demersal fisheries operating bottom nets. This communication represents the first record of S. acanthias bycatch in a commercial semi-pelagic longline fishery within Argentinean waters. In October-November 2005, 185 piked dogfish were captured (122 females and 63 males). The estimated mean catch rate was 0.37 sharks/1000 hooks (544,320 hooks deployed). Nearly half of the captured females and over 50% of captured males were morphometrically mature. The piked dogfish bycatch could have been influenced by the use of the Argentine shortfin squid Illex argentinus as bait; this squid is part of the sharks natural diet. Although S. acanthias is abundant in the region, we believe that the bycatch species could be more vulnerable than the targeted ones since the signs indicating a declining population of non-target species in commercial catches and collapses in bycatch populations go unnoticedinfo:eu-repo/semantics/openAccessEscuela de Ciencias del Mar. Pontificia Universidad Católica de ValparaísoInvestigaciones marinas v.35 n.1 20072007-05-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-71782007000100007en10.4067/S0717-71782007000100007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	piked dogfish bycatch semi-pelagic longline Patagonian Shelf
spellingShingle	piked dogfish bycatch semi-pelagic longline Patagonian Shelf Seco Pon,Juan P Gandini,Patricia A Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf
description	The piked dogfish Squalus acanthias is part of the bycatch of several South American longline fisheries, although in Argentina, it was only reported in the bycatch of benthic and demersal fisheries operating bottom nets. This communication represents the first record of S. acanthias bycatch in a commercial semi-pelagic longline fishery within Argentinean waters. In October-November 2005, 185 piked dogfish were captured (122 females and 63 males). The estimated mean catch rate was 0.37 sharks/1000 hooks (544,320 hooks deployed). Nearly half of the captured females and over 50% of captured males were morphometrically mature. The piked dogfish bycatch could have been influenced by the use of the Argentine shortfin squid Illex argentinus as bait; this squid is part of the sharks natural diet. Although S. acanthias is abundant in the region, we believe that the bycatch species could be more vulnerable than the targeted ones since the signs indicating a declining population of non-target species in commercial catches and collapses in bycatch populations go unnoticed
author	Seco Pon,Juan P Gandini,Patricia A
author_facet	Seco Pon,Juan P Gandini,Patricia A
author_sort	Seco Pon,Juan P
title	Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf
title_short	Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf
title_full	Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf
title_fullStr	Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf
title_full_unstemmed	Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf
title_sort	bycatch of the piked dogfish squalus acanthias linné, 1758 (chondrichthyes, squalidae) in semi-pelagic longline fisheries at the patagonian shelf
publisher	Escuela de Ciencias del Mar. Pontificia Universidad Católica de Valparaíso
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-71782007000100007
work_keys_str_mv	AT secoponjuanp bycatchofthepikeddogfishsqualusacanthiaslinne1758chondrichthyessqualidaeinsemipelagiclonglinefisheriesatthepatagonianshelf AT gandinipatriciaa bycatchofthepikeddogfishsqualusacanthiaslinne1758chondrichthyessqualidaeinsemipelagiclonglinefisheriesatthepatagonianshelf
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Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf

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