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11 pages, 7 figures, 2 tablesCatchability patterns of western Mediterranean Nephrops norvegicus were studied in\udrelation to depth and season by sampling animals during 4 continuous 24 h cycles of trawl hauls at\ud100 to 110 m and 400 to 430 m in October (near the autumn equinox) and June (near the summer\udsolstice). Bottom light intensity was recorded between consecutive catches. Catch data were transformed\udinto density estimates of animals emerging from their burrows. Results revealed a marked\udemergence rhythmicity: nocturnal with crepuscular peaks on the continental shelf, and diurnal on the\udcontinental slope. On the slope, peaks of catch occurred in phase with light intensity, whereas this did\udnot happen on the shelf. In particular, both benthic environments presented diel fluctuations in light\udintensity that differed within several orders of magnitude. These data indicate a differential physiological\udadaptation of N. norvegicus eyes to local photic conditions, implying a revision of the optimum\udlight intensity concept, already proposed in the literature. Emergence patterns were almost identical\udfor males, females and berried females, and these were not size-dependent.The present work was developed in the\udcontext of a national research project funded by the Spanish\udMinistry of Research (CICYT) (NERIT: MAR98-0935).Peer reviewe

Diel and seasonal patterns of Nephrops norvegicus (Decapoda: Nephropidae) catchability in the western Mediterranean