Objetivo
Anchovy is a species that constitutes an important resource for the fleets of the south-eastern Bay of Biscay (Spain and France). The fishery has historically been mainly Spanish, with a small share for the French. Catches have changed greatly over the last forty years, with a maximum of about 80.000 tons per year to a minimum of some 4.000 in the early eighties. They have since fluctuated considerably between the latter figure and 24.000 tons, but the trend is clearly declining.
Some measures have been proposed in order to manage the stock, such as precautionary total allowable catches (TAC) and minimum landing size, but they have not apparently taken into account the nature of fluctuations, which is most likely fishery independent. An assessment of the stock by direct methods, along with a study of the environmental conditions, seems essential for the regulation of the fishery.
Bearing this in mind, the project has been designed to compare 2 direct methods which have proved efficient in other fisheries: acoustic surveys and the daily egg production method (DEPM). The latter estimates the spawning stock biomass, and the former gives very good estimates of the total stock biomass. By comparing the results of both methods, it is expected to achieve an accurate knowledge of the stock abundance.
The shortcomings of the acoustic and daily egg production (DEPM) methods of assessing fish stocks as applied to the Bay of Biscay anchovy have been identified and corrected. Both methods indicate similar trends in describing the fluctuations of the anchovy population in the period 1989 to 1992. The methodology of the acoustic surveys was found to be appropriate for the area and season of study. Statistical analyses and tests proved the sampling strategy for the DEPM are also appropriate. With respect to the consistency of the production estimates the jack knife technique was applied to the egg data collected during the 1992 survey. It showed that the daily production is well determined by the model.
An important series of observations on the environmental and meteorological conditions has been carried out during the surveys. Sexual maturity seems to require a certain temperature of sea water. The distribution of eggs as well as the vertical and horizontal distribution of the adult anchovy may be influenced by the different moves of the water masses. No correlation between temperature, salinity and spawning intensity is evident.
The genotypic and phenotypic characters of the Bay of Biscay anchovy have been thoroughly studied. 2 different groups seem to form the population although the results do not support the pure or discrete stock concept.
The study of the variability of sexual maturity in space and time was done by the observation on the gonosomatic index. The variation of maturity can be modelled by the combined influence of several variables (ie sea water surface, salinity and fish weight). The observations have made evident the existence of maturity waves, and a different timing of the maturation of large and small anchovy.
The relationship of meteorological and environmental conditions with respect to recruitment has been analyzed. Upwelling is the only factor that seems to be positively correlated with recruitment.
The field work will be accomplished by a series of cruises named DAAG (Distribution et Abondance de l'Anchois dans le golfe de Gascogne) and BIOMAN (biomasa de la anchoa). Simultaneously, several aspects of the reproductive biology of the species will be taken into consideration. Success in reproduction is most important for the stock of anchovy, whose very short life span makes the stock most sensitive to weak year classes or cohorts.
Environmental factors are also to be taken into consideration. Their study is hoped to give some explanations on the vertical and horizontal distribution of the population, as well as about its availability to fishing gears. Data on this item will be collected and analyzed over the whole period covered by the project, along with a historical series of hydrological parameters and data on catch by size.
Ámbito científico (EuroSciVoc)
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
- ciencias agrícolas agricultura, silvicultura y pesca pesca
- ciencias naturales ciencias biológicas biología de la reproducción
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Las convocatorias de propuestas se dividen en temas. Un tema define una materia o área específica para la que los solicitantes pueden presentar propuestas. La descripción de un tema comprende su alcance específico y la repercusión prevista del proyecto financiado.
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Régimen de financiación (o «Tipo de acción») dentro de un programa con características comunes. Especifica: el alcance de lo que se financia; el porcentaje de reembolso; los criterios específicos de evaluación para optar a la financiación; y el uso de formas simplificadas de costes como los importes a tanto alzado.
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Coordinador
39080 Santander
España
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