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Title: Reducing the short-term mortality of juvenile school prawns ('Metapenaeus macleayi') discarded during trawling
Contributor(s): Macbeth, William G (author); Broadhurst, MK (author); Paterson, BD (author); Wooden, Michael Edward (author)
Publication Date: 2006
DOI: 10.1016/j.icesjms.2006.03.008
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Abstract: A field experiment was carried out in southeastern Australia to assess the short-term mortalityand stress incurred by juvenile school prawns ('Metapenaeus macleayi') discarded froman 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 commercialprocedures), then discarded into replicate cages. Total mortality was partitioned intothat 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 fromtrawls (by the use of bycatch reduction devices), the latter mortalities could be almost eliminatedby sorting and separating unwanted school prawns in water-filled compartments.Emersion stress was measured as concentrations of L-lactate in the haemolymph, whichwere 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 constantover at least the next 48 h, and were greater than baseline levels. The potential benefits associatedwith subtle changes to handling practices onboard estuarine trawlers are discussed.
Publication Type: Journal Article
Source of Publication: ICES Journal of Marine Science, 63(5), p. 831-839
Publisher: Oxford University Press
Place of Publication: United Kingdom
ISSN: 1054-3139
Field of Research (FOR): 050209 Natural Resource Management
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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