MEDITS-based information on the deep water red shrimps Aristaeomorpha foliacea and Aristeus antennatus (Crustacea: Decapoda: Aristeidae)

Special Volume: Mediterranean marine demersal resources: the Medits international trawl survey (1994-1999)The application of statistical models on a time series of data arising from the MEDITS International Trawl Survey, an experimental demersal resources survey carried out during six years (1994-1999) in the same season of the year (late spring - early summer) using the same fishing gear in a large part of the Mediterranean, has allowed for a study to compare, for the first time, the space-time distribution, abundance, and size structure of the two Aristeids Aristaeomorpha foliacea and Aristeus antennatus throughout most of the Mediterranean Sea. This research has shown a large variability among the six reference areas, that were arbitrarily defined within the basin. In particular the two shrimps do not seem to present any correlation or yield continuity in the years. The same lack of homogeneity was also observed in the time trend of the abundances and frequencies of each of the two species. These data seem to confirm the intrinsic variability of the species, the cause of which is still unknown and undocumented. Nevertheless, a longitudinal gradient of catches has been observed where A. antennatus is more abundant in the west and A. foliacea in the east of the basinVersión del editor1,006

A review of the biology and fisheries of the genus Plesionika Bate, 1888 (Decapoda: Caridea, Pandalidae) in European waters

The genus Plesionika has a widespread occurrence all over the world and consists mainly of deep-water shrimps. The species of this genus are nektobenthic, feeding on pelagic and benthic resources. Many studies have been made on the Plesionika species of the Mediterranean and European Atlantic region, mainly concerning their biogeography and ecology, but less their biology. In this region, there are eight species of the genus: Plesionika antigai, P. gigliolii, P. heterocarpus, P. martia, P. narval, P. acanthonotus, P. edwardsii, and P. ensis, all of small or no economic importanceEl género Plesionika se distribuye por todo el mundo y principalmente estás especies de gambas viven en fondos batiales. Las especies de este género son nectobentónicas y principalmente se alimentan de recursos pelágicos y bentónicos. Se han realizado diversos estudios sobre la biogeografía y ecología de las especies de Plesionika que se distribuyen en el Mediterráneo y en las regiones europeas del océano Atlántico, aunque en general su biología es poco conocida. En estas regiones se distribuyen 8 especies de este género: Plesionika antigai, P. gigliolii, P. heterocarpus, P. martia, P. narval, P. acanthonotus, P. edwardsii, and P. ensis, todas ellas de escasa, o nula, importancia económicaPublicado