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Recovery of substrates and macro-benthos after fishing trials with a new Portuguese clam dredge
Gaspar, M.B.; Santos, M.N.; Leitão, J.C.; Chícharo, L.; Chícharo, A.; Monteiro, C.C. (2003). Recovery of substrates and macro-benthos after fishing trials with a new Portuguese clam dredge. J. Mar. Biol. Ass. U.K. 83(4): 713-717
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Gaspar, M.B.
  • Santos, M.N.
  • Leitão, J.C.
  • Chícharo, L.
  • Chícharo, A.
  • Monteiro, C.C.

Abstract
    The effect of dredging on bottom structure was assessed, to estimate the damage inflicted on the benthic macrofauna left on the dredge path and to evaluate aggregations of scavengers within the track. Sediment suspended during dredging rapidly resettled both on sand and sandy-mud bottoms. Dredge tracks were deeper on sandy-mud sediments and persisted longer than in sandy sediments. The disappearance of tracks in both sediment types depended both on current strength and wave action. Damage and mortality induced by dredging on the macrobenthic animals left on the dredge path was relatively low. Post-fishing SCUBA diver observations showed that damaged animals left on the dredge path rapidly attracted scavengers, mainly Ophiura albida. Immediately after the tow ophiuroids reached densities eight times greater in the track region than in the background. However, they dispersed again rapidly because only few damaged fauna were available on the dredge tracks. Undamaged or slightly damaged shellfish started to rebury immediately after escaping from the dredge.

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