The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern Brazil

ABSTRACT: The behavior of the Argentine shortfin squid (Illex argentinus) in reaction to a trawl net is reported from images obtained during one fishing tow operated by a commercial trawler in May 2015 in slope grounds off southern Brazil (depth 370-361 m; 33°37’S, 50°49’W). Vide...

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Autores principales:	Alvarez Perez,José Angel, Yasunaka,Bruna Firmino de Oliveira, Rocha Visintin,Maurício
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2018
Materias:	trawl fishery Argentine shortfin squid trawl camera behavior swimming southern Brazil
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000500924
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spelling	oai:scielo:S0718-560X20180005009242019-04-03The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern BrazilAlvarez Perez,José AngelYasunaka,Bruna Firmino de OliveiraRocha Visintin,Maurício trawl fishery Argentine shortfin squid trawl camera behavior swimming southern Brazil ABSTRACT: The behavior of the Argentine shortfin squid (Illex argentinus) in reaction to a trawl net is reported from images obtained during one fishing tow operated by a commercial trawler in May 2015 in slope grounds off southern Brazil (depth 370-361 m; 33°37’S, 50°49’W). Video analysis utilized criteria to classify the horizontal and vertical distribution of squid in the field of view of the camera, posture (pitch and yaw), squid color patterns, escape reaction, swimming time and use of the tail fin. The monitored bottom trawl operation intercepted dense and patchily distributed schools of I. argentinus that could be observed for brief periods of time swimming ahead of the mouth of the trawl. Individuals were evenly distributed in the water column but concentrated on the center and right sectors of the trawl mouth. Most squids in the path of a trawl tended to swim by jet-propulsion for 10-20 s, tail-first and with regularly spaced fin flaps. Estimated speed (1.24 m s-1) was higher than cruise speed recorded for other ommastrephid squids in nature (0.3 m s-1), possibly reflecting an emergency escape reaction. After a period of sustained swimming ahead of the trawl, squid reacted in different ways including: a) slowing down and swimming into the net tunnel, b) shifting directions to escape through the trawl mouth sides, and c) swimming up, trying to escape over the top trawl panel, sometimes turning around pointing the tail towards the trawl mouth.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.46 n.5 20182018-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000500924en10.3856/vol46-issue5-fulltext-6
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	trawl fishery Argentine shortfin squid trawl camera behavior swimming southern Brazil
spellingShingle	trawl fishery Argentine shortfin squid trawl camera behavior swimming southern Brazil Alvarez Perez,José Angel Yasunaka,Bruna Firmino de Oliveira Rocha Visintin,Maurício The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern Brazil
description	ABSTRACT: The behavior of the Argentine shortfin squid (Illex argentinus) in reaction to a trawl net is reported from images obtained during one fishing tow operated by a commercial trawler in May 2015 in slope grounds off southern Brazil (depth 370-361 m; 33°37’S, 50°49’W). Video analysis utilized criteria to classify the horizontal and vertical distribution of squid in the field of view of the camera, posture (pitch and yaw), squid color patterns, escape reaction, swimming time and use of the tail fin. The monitored bottom trawl operation intercepted dense and patchily distributed schools of I. argentinus that could be observed for brief periods of time swimming ahead of the mouth of the trawl. Individuals were evenly distributed in the water column but concentrated on the center and right sectors of the trawl mouth. Most squids in the path of a trawl tended to swim by jet-propulsion for 10-20 s, tail-first and with regularly spaced fin flaps. Estimated speed (1.24 m s-1) was higher than cruise speed recorded for other ommastrephid squids in nature (0.3 m s-1), possibly reflecting an emergency escape reaction. After a period of sustained swimming ahead of the trawl, squid reacted in different ways including: a) slowing down and swimming into the net tunnel, b) shifting directions to escape through the trawl mouth sides, and c) swimming up, trying to escape over the top trawl panel, sometimes turning around pointing the tail towards the trawl mouth.
author	Alvarez Perez,José Angel Yasunaka,Bruna Firmino de Oliveira Rocha Visintin,Maurício
author_facet	Alvarez Perez,José Angel Yasunaka,Bruna Firmino de Oliveira Rocha Visintin,Maurício
author_sort	Alvarez Perez,José Angel
title	The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern Brazil
title_short	The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern Brazil
title_full	The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern Brazil
title_fullStr	The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern Brazil
title_full_unstemmed	The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern Brazil
title_sort	behavior of the argentine shortfin squid (illex argentinus) exposed to bottom trawl gear off southern brazil
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2018000500924
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The behavior of the Argentine shortfin squid (Illex argentinus) exposed to bottom trawl gear off southern Brazil

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