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First observations on Nephrops Norvegicus (L.) Burrow Densities on the Continental Shelf off the Catalan Coast (Western Mediterranean)

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The density of Nephrops norvegicus burrows on the lower continental shelf (100-120 m depth) off the Catalan coast (western Mediterranean) was estimated by underwater photography. A total of 68 burrows were identified in 84 m2, equivalent to 0.81 burrows per m2. The conversion of this value to km2 gave an estimate of 81 × 104 burrows in the study area. To obtain the approximate number of animals performing emergence on a diel basis, density estimates were compared with those obtained over 24 h in a previous trawl survey, carried out in the same area at days of maximum and minimum catches. Findings are discussed taking into account already available data for the northeastern Atlantic, the Adriatic Sea, and the Aegean Sea. Se estimó la densidad de madrigueras de Nephrops norvegicus en la plataforma continental (100-120 m) de la costa catalana (Mediterráneo oeste) mediante el uso de fotografía submarina. Se contaron un total de 68 madrigueras por 84 m2 de superficie muestreada, lo cual equivale a 0.81 agujero por m2 . La extrapolación a km2 da un total de 81 × 104 madrigueras en el área de estudio. Con el fin de obtener el número aproximado de animales que realizan emergencia de la madriguera con un ritmo circadiario, se compararon las densidades de madrigueras con la densidad de individuos, obtenida ésta última sobre las capturas máximas y mínimas de muestreos realizados anteriormente con un arte de arrastre, en la misma zona y para un intervalo de 24 h. Los resultados se discuten teniendo en cuenta la información disponible de densidades de madrigueras del Atlántico, Adriático y Egeo.

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