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Reducing the short-term mortality of juvenile school prawns (Metapenaeus macleayi) discarded during trawling

Macbeth, W.G. and Broadhurst, M.K. and Paterson, B.D. and Wooden, M.E.L. (2006) Reducing the short-term mortality of juvenile school prawns (Metapenaeus macleayi) discarded during trawling. ICES Journal of Marine Science, 63 (5). pp. 831-839.

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Article Link(s): http://dx.doi.org/10.1016/j.icesjms.2006.03.008

Publisher URL: http://www.oup.co.uk/

Abstract

A field experiment was carried out in southeastern Australia to assess the short-term mortality and stress incurred by juvenile school prawns (Metapenaeus macleayi) discarded from an estuarine trawler. Some 35% of the prawns died up to 72 h after being caught in a trawl, exposed to air during sorting and separation from the retained catch (as per normal commercial procedures), then discarded into replicate cages. Total mortality was partitioned into that caused by trawling (about 16% of mortalities), and by subsequent sorting and grading (about 19%). Assuming that the majority of the non-penaeid bycatch is excluded from trawls (by the use of bycatch reduction devices), the latter mortalities could be almost eliminated by sorting and separating unwanted school prawns in water-filled compartments. Emersion stress was measured as concentrations of l-lactate in the haemolymph, which were elevated for at least 40 min following capture, but similar among all trawled treatments. l-lactate levels decreased within the first 24 h post-capture, then remained constant over at least the next 48 h, and were greater than baseline levels. The potential benefits associated with subtle changes to handling practices onboard estuarine trawlers are discussed.

Item Type:Article
Corporate Creators:Animal Science
Additional Information:© International Council for the Exploration of the Sea. © Oxford University Press.
Keywords:Discard; estuarine fisheries; L-lactate; Metapenaeus macleayi; mortality; Penaeid; prawn; square-mesh codend; stress; trawl.
Subjects:Aquaculture and Fisheries > Fisheries > Fishery research
Aquaculture and Fisheries > Fisheries > Methods and gear. Catching of fish
Aquaculture and Fisheries > Fisheries > Fishery conservation
Aquaculture and Fisheries > Fisheries > Shellfish fisheries
Deposited On:27 Feb 2009 06:26
Last Modified:06 Sep 2010 07:32

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