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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||Handle Link:||https://hdl.handle.net/1959.11/1312||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||Statistics to Oct 2018:||Visitors: 157
|Appears in Collections:||Journal Article|
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