
TY  - JOUR
A1  - Marín, Yamandú H. 
A1  - Brum, Federico 
A1  - Barea, Luis C. 
A1  - Chocca, Julio F. 
T1  - Incidental catch associated with swordfish longline fisheries in the south-west Atlantic Ocean
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1999
VL  - 49
IS  - 7
SP  - 633
EP  - 639
KW  - Drift longline, by-catch
UR  - https://doi.org/10.1071/MF97243 
N2  - This paper describes the composition of the harvest by species of two vessels operating with two different pelagic longline systems aimed at swordfish (Xiphias gladius). Four zones were surveyed in the Uruguayan EEZ and international waters in the south-western Atlantic. Data were collected by observers on board who recorded the number of individuals in each of the species caught. In all, 50 species were caught, of which 15 were cartilaginous fish, 27 were teleosts and eight were &#8216;non- fish&#8217; species (birds, mammals and turtles). The most abundant species were blue shark (Prionace glauca) (43%), swordfish (27%) and albacore tuna (Thunnus alalunga) (9%). The abundances of blue shark and of swordfish differed significantly between the two rigging systems and among the four zones. The catch was classified into three marketing groups: primary marketing (swordfish and high-price tuna), secondary marketing (non-target species but marketable) and discards (with no commercial value). In terms of numbers, the first two groups represented between 91% and 72% of the species collected. This percentage may vary if the catch is analysed by weight, as only part of the carcass and shark fins are used. Resumen. Se describe la composici&oacute;n por especies de la captura de dos buques que operaron con dos sistemas diferentes de palangre pel&aacute;gico dirijido a la extracci&oacute;n de pez espada (Xiphias gladius). Se relevaron quatros &aacute;reas que abarcaron la ZEE uruguaya y aguas internacionales en el O. Atl&aacute;ntico. Los datos fueron colectados a bordo por observadores, registrando la captura en n&uacute;mero de la totalidad de las especies. Se contabiliz&oacute; un total de 50 especies capturadas, de las cuales 15 corresponden a peces cartilaginosos, 27 a peces &oacute;seos y 8 a &#8216;non-pisces&#8217; (aves, mam&#237;feros y quelonios). Las especies m&aacute;s representadas fueron el tibur&oacute;n azul (Prionace glauca) (43%), seguida por pez espada (27%) y albacora (Thunnus alalunga) (9,0%). La presencia de tibur&oacute;n azul y pez espada mostr&oacute; diferencias significativas comparando los dos sistemas de construcci&oacute;n del palangre y las zonas. Se clasific&oacute; la captura en tres grupos de comercializaci&oacute;n: comercializaci&oacute;n primaria (pez espada y atunes de elevado valor), comercializaci&oacute;n secundaria (especies diferentes de la objetivo pero comercializables), y decarte (sin valor comercial). Las dos primeras acumularon entre el 91% y 72% de las piezas capturadas. Este porcentaje puede variar si se analiza la captura en peso, ya que de los tiburones se aprovechan las aletas y solamente parte de las carcasas. 
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