Note on the diameter of otolith nucleus as a characteristic of the population groups of anchovy, Engraulis encrasicolus (Linnaeus, 1758), of the Cantabrian Sea and Galicia

The diameters of the nuclei of anchovy, Engraulis encrasicolus (Linnaeus, 1758), otoliths collected in 1995 and 1998 in the eastern Cantabrian Sea, the western Cantabrian Sea and Galicia (northwest Spain) have been measured to check possible differences in their length and, if they existed, whether they were characteristic of a different growth rate of the population groups of this species. Significant differences among the three regions were found. Although our results must be considered only preliminary, they seem to indicate that such differences can be characteristics of the population groups described in the regions studied.Se ha medido el diámetro del núcleo de otolitos de anchoa, Engraulis encrasicolus (Linnaeus, 1758), recogidos en el Cantábrico oriental, en el occidental y en Galicia durante 1995 y 1998 para comprobar si existían diferencias en su longitud y, si era así, si estas diferencias eran características de los grupos de población de la especie. Los resultados muestran diferencias significativas entre las tres regiones y, aunque deben considerarse solamente como preliminares, parecen indicar que estas diferencias pueden ser propias de los grupos de población de anchoa descritos en las regiones estudiadas.Instituto Español de Oceanografí

Investigations on anchovy (Engraulis encrasicolus Linnaeus, 1758) by the IEO (Instituto Español de Oceanografía) in the northern and central eastern Atlantic

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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

Detailed spectroscopy of doubly magic Sn-132

The structure of the doubly magic Sn-132(50)82 has been investigated at the ISOLDE facility at CERN, populated both by the beta(-) decay of In-132 and beta(-)-delayed neutron emission of In-133. The level scheme of Sn-13(2) is greatly expanded with the addition of 68 gamma transitions and 17 levels observed for the first time in the beta decay. The information on the excited structure is completed by new gamma transitions and states populated in the beta-n decay of In-133. Improved delayed neutron emission probabilities are obtained both for In-132 and In-133. Level lifetimes are measured via the advanced time-delayed beta gamma gamma(t) fast-timing method. An interpretation of the level structure is given based on the experimental findings and the particle-hole configurations arising from core excitations both from the N = 82 and Z = 50 shells, leading to positive- and negative-parity particle-hole multiplets. The experimental information provides new data to challenge the theoretical description of Sn-132

Horse mackerel: identification of stocks. Foreword.

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Parasites as biological tags

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Parasites as biological tags for stock discrimination of marine fish: a guide to procedures and methods

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La oferta de anchoa para la industria transformadora de la Comunidad Autónoma de cantabria. La anchoa: biología, pesquerías y dinámica de poblaciones.

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La anchoa del golfo de Vizcaya: un recurso pesquero en crisis. Perspectivas científicas

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