Discards of the trawl and long line Spanish fleets in ICES Subarea VII in 1994

Within the framework of a European Union (UE) contract and with voluntary participation of commercial fishing vessels, a discard sampling programme based on stratified random sampling by fisheries covered the activities of trawl and long line Spanish fleets fishing in ICES Subarea VII in 1994. Discards of commercial and non-commercial species, including species of pinnipeds, cetaceans, sea turtles and sea birds, caught incidentally were estimated in kg per fishing hour by ICES rectangle and depth stratum in 1994. The sampling programme was carried out by observers on board commercial fishing vessels during normal fishing activity. A total of 238 species caught by trawlers and 76 by long liners were determined. The comparison of the two fleets regarding their ratios of discards in 1994 shows that the larger percentages of discards relative to total catches are found in the trawl fisheries (48%) and around 50% are primarily due to the discards of three species of fish and one of crustacea. Seasonal variation in the case of discards of the two main species (Great Silver Smelt and Horse Mackerei) was observed. The depth at which discards were hig lies between 200 and 400m. Conversely, long line fishing in Subarea VII shows a lower discard rate than that of trawlers (10%). Approximately 60% of discards primarily comprise two species of fish, Blue Whiting and Great Silver Smelt, both of which show the highest discard value per f.h. in the 3rd quarter. No differences were observed by depth strata

Factors affecting discards by the coastal Spanish North Atlantic trawlers

Variations in the total discard in weight were evaluated by Spanish trawler fleet operating in the North Atiantic Spanish coast in 1994. The data used for this study came from observers on board commercial fishing boats in ICES Divisions VIIIe and IXa during normal fishing activity. A total of 493 hauls were analysed and 221 commercial and non-commercial species discarded were determined. The response variable studied is the whole discard of all species per unit effort. A general analysis of covariance was carried out with the following sources of variation: trip, quarter, area, port, three types of gears, groups of boats (using multivariant analysis of classification) and as covariables: total eatch per unit effort, fishing hours, depth, tonnage, horsepower and length of the boats studied. The results show a great variation in the discard values by unit of effort for this fleet, except for the intra-annual variation

Memoria anual del Centro Oceanográfico de Vigo 2015

En esta Memoria se presentan las actividades de investigación y los resultados alcanzados en 2015 por investigadores del Centro Oceanográfico de Vigo (COV) del Instituto Español de Oceanografía (IEO). Se presenta también el análisis de la evolución de las actividades de investigación y de sus resultados durante el período 2011-2015. En ambos casos se emplean los indicadores más habituales para medir estas actividades (participación en proyectos, tipo de financiación, competitividad, liderazgo, producción científica por tipos documentales, nº de artículos WOS, etc). Los datos se presentan globalmente para todo el Centro y desglosados por Área de Investigación (Acuicultura, Medio Marino y Protección Ambiental, y Pesquerías). En 2015, los investigadores integrados en los distintos equipos del COV participaron en un total de 72 proyectos de investigación, mientras que en 2011-2015 el número de proyectos ascendió a 342. El 42% de los proyectos iniciados en 2015 contaron con financiación internacional, lo que es claro indicador del alto nivel de competitividad internacional del Centro. En lo referente a la producción científica, en 2015 se registraron un total de 236 referencias correspondientes a los diferentes tipos documentales, entre las que cabe destacar 48 trabajos incluidos en la Web of Science (WOS), el 57% publicado en revistas del primer cuartil (Q1). Destacan también los 113 informes de asesoramiento a las diferentes administraciones

Mesh size and effort changes in multispecies fisheries in ICES Divisions Vlllc and IXa.

Different simulations varying trawl mesh size and effort changes for several fishing units in ICES Divisions VIllc and IXa were carried out. Landings included in the analysis represent most of the catches in the southern area defined as the management unit for hake, megrim; monkfish, horse mackerel, blue whiting and mackerel. Three Nephrops stock s in Divisions Vlllc and IXa are also included. These species are mainly exploited by Spanish and Portuguese fleets, using various fishing gears to exploit different fractions of the populations, and for this reason nine fishing units were used in the analysis

Cambios de malla y esfuerzo en las pesquerías multiespecíficas en aguas atlánticas de la península Ibérica

Se han realizado diferentes ensayos de cambios de malla y esfuerzo para varias unidades pesqueras de las divisiones VIIIc y IXa del CIEM (Consejo Internacional pqra la Exploración del Mar). Los desembarcos incluidos en este análisis representan la mayoría de las capturas de las especies de merluza, gallos, rapes, jurel, lirio y caballa en la zona sur, definida como unidad de gestión. Están también incluidos tres stocks de cigala de estas divisiones. Dichas especies son las principales especies explotadas por las flotas española y portuguesa, que usan diferentes tipos de artes para explotar diferentes fracciones de las poblaciones. Por esta razón en el presente análisis se utilizaron nueve unidades pesqueras.Different simulations varying trawl mesh size and effort changes for several fishing units in ICES Divisions VIIIc and IXa were carried out. Landings included in the analysis represent most of the catches in the southern area defined as the management unit for hake, megrim, monkfish, horse mackerel, blue whiting and mackerel. Three Nephrops stocks in Divisions VIIIc and IXa are also included. These species are mainly exploited by Spanish and Portuguese fleets, using various fishing gears to exploit different fractions of the populations; for this reason, nine fishing units were used in the analysis.Versión del editor0,000

Fisheries and Prestige. Review and update of studies on the effects of the Prestige oil spill

The Prestige oil tanker sank in November 2002 and leaked around 60 000 mt. of heavy oil (type M-100) into the sea. Immediately after the accident, closed areas were established. Among the fleets affected by the closures were four of the most important in ICES Division VIIIc and Sub-division IXa North (bottom trawl, pair trawl, purse seine targeting sardine and hand line targeting mackerel) as they exploit considerable resources, some outside biological safety limits. A fall in effort was observed in all of them, mainly in the first quarter and in sub-divisions VIIIc West and IXa North, although it failed to lead to a very large reduction in the total annual effort of each of the fleets, with the exception of hand line. Pair trawlers can make two types of fishing trip, but differences in specific composition among the three years analysed were not found in either of them. In the case of trawl, five kinds of fishing trips were identified, and changes were only found in the type that targets Norway lobster, hake, megrim and monk (HMMN), with a fall in the presence of Norway lobster

Descartes de la flota española en el área del ICES

Versión del editor0,000