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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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          Abstract

          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.

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          Most cited references28

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          Global analysis of response and recovery of benthic biota to fishing

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            Modifications to reduce bycatch in prawn trawls: A review and framework for development

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              Fishing down Canadian aquatic food webs

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                lajar
                Latin american journal of aquatic research
                Lat. Am. J. Aquat. Res.
                Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar (Valparaíso, , Chile )
                0718-560X
                December 2018
                : 46
                : 5
                : 924-934
                Affiliations
                [1] Itajaí Santa Catarina orgnameUniversidade do Vale do Itajaí orgdiv1Escola do Mar Brazil
                Article
                S0718-560X2018000500924
                10.3856/vol46-issue5-fulltext-6
                acf7d837-905d-460f-9761-77d08dd7c393

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

                History
                : 03 October 2017
                : 21 April 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 41, Pages: 11
                Product

                SciELO Chile

                Categories
                Research Articles

                trawl fishery,Argentine shortfin squid,trawl camera,behavior,swimming,southern Brazil

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