Seabird and marine-mammal attendance and by-catch in semi-industrial trawl fisheries in near-shore waters of northern Argentina
Juan Pablo Seco Pon A G , Sofía Copello A , Ariel Moretinni B , Hugo P. Lértora C , Ignacio Bruno D , Julián Bastida E , Laura Mauco F and Marco Favero AA Grupo Vertebrados, Instituto de Investigaciones Marinas y Costeras (IIMyC), CONICET – UNMDP, Funes 3250 (B7602AYJ) Mar del Plata, Argentina.
B Misiones 2274 (B7600BHN) Mar del Plata, Argentina.
C Laboratorio de Ictiología, Departamento de Ciencias Marinas, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3250 (B7602AYJ) Mar del Plata, Argentina.
D Fundación Aquamarina/CECIM, Programa Regional de Investigación y Conservación de Tortugas Marinas de Argentina (PRICTMA), Buenos Aires, Argentina.
E Alvarado 2921 1° G (B7600BHN) Mar del Plata, Argentina.
F Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3250 (B7602AYJ) Mar del Plata, Argentina.
G Corresponding author. Email: secopon@mdp.edu.ar
Marine and Freshwater Research 64(3) 237-248 https://doi.org/10.1071/MF12312
Submitted: 9 June 2012 Accepted: 1 January 2013 Published: 18 March 2013
Abstract
Seabird and marine-mammal attendance and by-catch in mid-water and bottom otter semi-industrial coastal pair-trawl fisheries were assessed for the first time in northern Argentina. Observers were placed onboard trawlers between autumn 2007 and autumn 2008. Fifteen marine top-predator species were associated with the vessels. The most abundant and frequent seabirds (trawl fisheries combined) were the kelp gull, Larus dominicanus (~70% of total birds and >96% occurrence), and the Olrog’s gull, L. atlanticus (~12% and >50%, respectively). Other seabird taxa such as Procellariiforms and Sphenisciforms, among others, were represented in very low numbers. The only mammal species recorded was the South American sea lion, Otaria flavescens (1% and 2%, respectively). Analysis of environmental and operational variability affecting the abundance of gulls indicated a significant increase in abundance with fishing depth, time of day, seasonality, wind intensity and wind direction. Incidental mortality of top predators was low and comprised only Magellanic penguins, Spheniscus magellanicus, in the mid-water gear. The results of the present study showed that the semi-industrial trawl fisheries operating in coastal waters in northern Argentina may a have a relatively minor impact on marine top-predator populations, at least in terms of incidental capture.
Additional keywords: fishery–top predator interactions, pair-trawl coastal fisheries, marine top predators, South America.
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