Depth-size trends in western Mediterranean demersal deep-sea fishes

• Published in: Marine Ecology Progress Series
• Main Authors: Stefanescu, Constantino, Rucabado, Jaume, Lloris, Domingo
• Format: Article in Journal/Newspaper
• Language: English
• Published: Inter Research 1992
• Subjects: Fishes; Depth-size; Mediterranean; Catalan Sea; North Atlantic
• Online Access: http://hdl.handle.net/10261/32045; https://doi.org/10.3354/meps081205

Se discute y argumenta la distribución de los peces en función de su talla. Gráficos, Tallas, Tablas. We analyze the bathymetric trends of demersal deep-sea flshes in the Catalan Sea (NW Medlterranean) between 1000 and 2250 m depth In the first part of the study, only the pattern shown by the whole fauna (wthin-fauna pattern ) 1s considered At 1200 m there is a significant decrease In fish mean welght, as a consequence of the replacement of the dominant large or medium-sized specles by small ones This fauna1 shift may be a consequence of the lower trophic availability at greater depths, as shown by an important decrease in megafaunal biomass between 1000 and 2250 m In the second part, the study focuses on the depth-size trends of the most common species (within-species pattern) Results show that the bigger-deeper phenomenon is not a well-estabhshed tendency None of the lower slope species and only 2 of the 5 middle slope species analyzed behave as bigger-deeper species Moreover some specles which display a bigger-deeper trend in North Atlantic waters do not show any significant trend In the Medlterranean Considering the recent Atlantic origin of Mediterranean ichthyofauna and the contrasting behaviour in the 2 areas, the hypothesis that mean slze increase with depth is the result of inherited ontogenic behaviour can be discarted. Research program BATIMAR (CSICCAICYT; reference PAC 86-008/ID 821). Peer reviewed