caa a22 4500 445893028 CHVBK 20180317145622.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10750-011-0670-z doi (NATIONALLICENCE)springer-10.1007/s10750-011-0670-z Assessment of the deep water trawl fishery off the Balearic Islands (western Mediterranean): from single to multi-species approach [Elektronische Daten] [Beatriz Guijarro, George Tserpes, Joan Moranta, Enric Massutí] The bottom trawl fishery developed on the slope off Balearic Islands (western Mediterranean) has been analysed from different sources of information: (i) data obtained during experimental bottom trawl surveys developed annually since 2001; (ii) daily sale bills from the bottom trawl fleet, available since 2000. Considering both hydrographical and geomorphologic conditions, the study area was divided in four geographical sectors. Multivariate techniques were applied to identify assemblages and their main species, and to investigate the influence of environmental variables in the slope communities. Fishery-independent and fishery-dependent indicators were calculated, both at specific and community level, for the assemblages identified. In all cases, they were summarised using the Traffic Light approach. Three assemblages have been identified in the slope trawl fishing grounds off the Balearic Islands: (1) the almost unexploited shelf break, where teleosts predominate; (2) the upper slope, where teleosts still predominate but crustaceans are also very important (with Nephrops norvegicus as target species); (3) and the middle slope, where crustaceans predominate (with Aristeus antennatus as target species). Depth was the main factor affecting the species composition of the assemblages, although other factors such as area, year and effort level also affect. Indicators estimated from both sets of data suggested an improvement in the state of N. norvegicus, although the results suggest the influence of other factors than fishing impact in the state of this resource. For A. antennatus, marked differences have been found depending on the data source. In the upper slope, indicators suggested an improvement in the state of this assemblage, which can be related to a decreasing trend found in the fishing effort exerted in this depth range. Indicators from the middle slope showed differences for both sets of data. The characteristics of both data sources and of the species analysed are discussed as responsible of these differences. Springer Science+Business Media B.V., 2011 Nephrops norvegicus nationallicence Aristeus antennatus nationallicence Assessment nationallicence Community nationallicence Ecosystem approach nationallicence Indicators nationallicence Traffic Lights nationallicence Guijarro Beatriz Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Moll de Ponent s/n, 07015, Palma, Spain aut Tserpes George Hellenic Centre for Marine Research (HCMR), Institute of Marine Biological Resources, P.O. Box 2214, 71003, Poros, Heraklion, Greece aut Moranta Joan Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Moll de Ponent s/n, 07015, Palma, Spain aut Massutí Enric Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Moll de Ponent s/n, 07015, Palma, Spain aut Hydrobiologia Springer Netherlands 670/1(2011-07-01), 67-85 0018-8158 670:1<67 2011 670 10750 https://doi.org/10.1007/s10750-011-0670-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0670-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Guijarro Beatriz Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Moll de Ponent s/n, 07015, Palma, Spain aut NATIONALLICENCE 700 1- Tserpes George Hellenic Centre for Marine Research (HCMR), Institute of Marine Biological Resources, P.O. Box 2214, 71003, Poros, Heraklion, Greece aut NATIONALLICENCE 700 1- Moranta Joan Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Moll de Ponent s/n, 07015, Palma, Spain aut NATIONALLICENCE 700 1- Massutí Enric Instituto Español de Oceanografía, Centre Oceanogràfic de les Balears, Moll de Ponent s/n, 07015, Palma, Spain aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 670/1(2011-07-01), 67-85 0018-8158 670:1<67 2011 670 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer