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ICES Journal of Marine Science: Journal du Conseil 2000 57(3):517-524; doi:10.1006/jmsc.2000.0708
© 2000 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Rapido trawling in the northern Adriatic Sea: effects on benthic communities in an experimental area

F. Pranovi, S. Raicevich, G. Franceschini, M. G. Farrace and O. Giovanardi

Dipartimento Scienze Ambientali, Univ. Ca'Foscari 2737/B Castello 30122 Venezia, Italy
Istituto Centrale per la Ricerca Applicata al Mare Viale Stazione 5, Chioggia (VE), Italy

[tel: +39 041 2578435, fax: +39 041 5281494; e-mail: fpranovi{at}unive.it]

The rapido is a towed gear used only in the Adriatic Sea for fishing scallops in sandy offshore areas and flatfish in muddy inshore areas. The gear is expected to have a high impact on the entire benthic community, mainly on epifauna and organisms living in the upper sediment layers. To obtain information on likely medium- to long-term effects of trawl fishing in the northern Adriatic Sea, an experiment on immediate/short-term effects was carried out in an undisturbed sandy area near a wreck. The rapido produced flat tracks on the bottom that were still clearly visible after a week by means of sidescan sonar. The trawl did not change the sediment grain size, although it did disturb the upper 6 cm of sediment. Experimental trawling induced a modification in the macrobenthic community that was most evident immediately after the haul. Changes to the meiobenthic community were probably due to sediment disturbance and were recorded after 1 week. Comparison between an undisturbed control area and a neighbouring commercially exploited area allowed some evaluation of long-term changes in the benthic community.

Keywords: Adriatic Sea, fishing disturbance, macrobenthos, meiobenthos, trawling


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