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Browsing Publicaciones periódicas by Author "Arana, Patricio"
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Item Fishing with pots in deep-waters in the Antarctic region (Statistical Subareas 48.1, 48.2 and 88.3)(1999) Arana, PatricioResults of the February-March 1998 exploratory and experimental fishing operations using pots are described. This research took place during the New Fisheries Project carried out by Chile to determine the presence of Dissostichus spp. in Statistical Subareas 48.1, 48.2 and 88.3. In each location where industrial bottom longlines were used, six pots were lowered, three at each end of the fishing gear, with a distance of approximately 90 m between them. The pots were lowered at a depth of 290-1920 m. A total of 300 pots of four different designs were used. Approximately 1 kg of either whole salted sardines (Sardinops sagax) or squid (Illex argentinus) were used as bait. According to total weight obtained with pots, the main resources were Antarctic crab (Paralomis birsteini) (28%), striped-eyed rockcod (Lepidonotothen kempi) (17%), eelpout (Lycenchelys bellingshauseni) (13%) and smalleye moray cod (Muraenolepis micropsy (11 %). Regarding the number of individuals caught, amphipods (55%), were followed by Antarctic crab (15%( and eelpout (12%). Among the species caught, P. birsteini was the one resource that stood out the most with 110.7 g/pot, striped-eye rockcod (L. kempi) with 67.4 g/pot and eelpout (L. bellingshauseni) with 51.2 g/pot. In ,general, P. birsteini was captured in all researched Subareas, with highest yield in Subarea 48.2 (548.8 g/pot).Item Seabird observations during fishing longline operations in the Antarctic region (Statistical Subareas 48.1, 48.2 and 88.3)(1999) Benavides, Gonzalo; Arana, PatricioEn febrero y marzo de 1998 se efectuó un crucero de 43 días de duración con el buque espinelero factoría Tierra del Fuego, como parte de los Proyectos de Nuevas Pesquerías desarrollado por Chile en la Antártica (Subáreas estadísticas 88.3, 48.1 Y 48.2). Durante dicha investigación se adoptaron todas las medidas vigentes para impedir la mortalidad incidental de aves, realizándose además observaciones de aves marinas en cada uno de los 52 lances realizados con espineles de diseño español. No se registró captura y mortalidad incidental de aves durante las faenas de pesca realizadas. En todo el crucero se observó un total de 436 aves, siendo la mas abundante Thulassarche melanophrys con 204 avistamientos, seguida de Oceanities oceanicus con 77, Catharacta lonnbergi con 40 y Thalassarche chrysostoma con 37. La Subárea que presentó una mayor abundancia relativa en avistamientos fue la 48.1 con 11.1 aves/lance, seguida por la 48.2 y la 88.3 con 7.6 y 5.0 aves/lance. La distribución de especies fue diferente en cada Subárea, siendo la mas abundante la Subárea 48.1 con un total de 10 especies observadas y la menos abundante la 48:2, con sólo 4 especies presentes.