Especies de condrictios en aguas profundas del mar Mediterráneo

[EN] Data collected during the DESEAS survey carried out in three areas of the Mediterranean Sea (Balearic Sea, western and eastern Ionian Sea) were used to describe the distribution and abundance of chondrichthyes species at depths between 600 and 4000 m. A total of 8 chondrichthyes species were recorded, 5 of them in the Balearic Sea, 4 in the western Ionian and 6 in the eastern Ionian. A decrease in abundance with depth was observed in each species with the exception of Centroscymnuscoelolepis. The most abundant species were Galeus melastomus and Etmopterusspinax. The depth range of some species was updated. G. melastomus was caught down to 1500 m, exhibiting a smaller-deeper pattern in females, while E.spinax was captured down to 2200 m with a bigger-deeper trend. Mature females of these two sharks were found between 600 and 1500 m. A wide size-range was shown in both species. C.coelolepis was only collected in the Balearic Sea down to 2800 m. The presence of a pregnant female was sampled from a depth of 1500 m. The distribution of the species is discussed in the context of the present knowledge of the Mediterranean ichthyofauna[ES] Para describir la distribución y abundancia de las especies de condrictios a profundidades entre 600 y 4000 m, se utilizaron muestras de la campaña DESEAS en tres áreas del Mediterráneo (mar Balear y Iónico oriental y occidental). Se registraron un total de 8 especies de condrictios de las cuales 5 de ellas corresponden al mar Balear, 4 al Iónico occidental y 6 al Iónico oriental. En cada una de las especies se observaó un descenso de abundancia con la profundidad a excepción de Centroscymnus coelolepis. Las especies más abundantes fueron Galeus melastomus y Etmopterus spinax. Se amplió el rango de distribución de algunas especies, G. melastomus fue capturado por debajo de 1500 m y las hembras redujeron su talla con la profundidad (smaller-deeper pattern), mientras que E. spinax que se capturó hasta 2200 m presentó una tendencia a aumentar su tamaño con la profundidad (bigger-deeper trend). Entre 600 y 1500 m se encontraron hembras maduras de estas dos especies. También ambas especies presentaron un amplio rango de tallas. C. coelolepis solo se encontró en el mar Balear a 2800 m de profundidad. De esta especie se encontró una hembra ovada a 1500 m. Finalmente se discute la distribución de estas especies en el marco de los conocimientos actuales de la ictiofauna mediterráneaThis work was supported by the Directorate General of Fisheries of the European Commission as part of the DESEAS project (Exploratory survey to collect data of the exploited and virgin stocks of deepsea shrimp A. antennatus, of interest to the CFP Study contract 2000/39, D.G. XIV)Peer reviewe

Chondrichthyes species in deep waters of the Mediterranean Sea

Data collected during the DESEAS survey carried out in three areas of the Mediterranean Sea (Balearic Sea, western and eastern Ionian Sea) were used to describe the distribution and abundance of chondrichthyes species at depths between 600 and 4000 m. A total of 8 chondrichthyes species were recorded, 5 of them in the Balearic Sea, 4 in the western Ionian and 6 in the eastern Ionian. A decrease in abundance with depth was observed in each species with the exception of Centroscymnus coelolepis. The most abundant species were Galeus melastomus and Etmopterus spinax. The depth range of some species was updated. G. melastomus was caught down to 1500 m, exhibiting a smaller-deeper pattern in females, while E. spinax was captured down to 2200 m with a bigger-deeper trend. Mature females of these two sharks were found between 600 and 1500 m. A wide size-range was shown in both species. C. coelolepis was only collected in the Balearic Sea down to 2800 m. The presence of a pregnant female was sampled from a depth of 1500 m. The distribution of the species is discussed in the context of the present knowledge of the Mediterranean ichthyofauna