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ICES Journal of Marine Science: Journal du Conseil 2004 61(8):1260-1266; doi:10.1016/j.icesjms.2004.07.024
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Impact of experimental trawling on the benthic assemblage along the Tuscany coast (north Tyrrhenian Sea, Italy)

Anna Maria De Biasi*

Centro Interuniversitario di Biologia Marina ed Ecologia Applicata V.le N. Sauro 4, I-57127 Livorno, Italy

*Correspondence to A. M. De Biasi: tel: +39 586 807287; fax: +39 586 809149. e-mail: a.debiasi{at}cibm.it.

The impact of repeated experimental otter trawling, in the north Tyrrhenian Sea (Mediterranean) was investigated using a spatially replicated sampling design. Macroscopic modifications of the seabed morphology were assessed by sidescan sonar. Alterations of the sediment texture and changes in macrobenthic infauna were assessed using a box-corer. The most obvious modifications of the seabed were trawl tracks caused by the passage of trawl doors through the sediments. Ephemeral but significant changes in the sediment composition were observed. Changes in the benthic assemblage were detected only 48 h after experimental trawling. The clearest changes were detected in the molluscan component. The present study suggests that recovery from trawling may take place within one month.

Keywords: fishing impact, grain size, molluscs, north Tyrrhenian Sea, soft bottoms, trawling

Received 11 October 2003; accepted 30 July 2004.


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