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• W1975850808 abstract "DAO Diseases of Aquatic Organisms Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials DAO 76:173-186 (2007) - doi:10.3354/dao076173 Damage and partitioned mortality of teleosts discarded from two Australian penaeid fishing gears Sebastian S. Uhlmann1,*, Matt K. Broadhurst2 1School of Environmental Sciences and Natural Resources Management, University of New England, National Marine Science Centre, PO Box J321, Coffs Harbour, New South Wales 2450, Australia 2New South Wales (NSW) Department of Primary Industries, Fisheries Conservation Technology Unit, PO Box J321, Coffs Harbour, New South Wales 2450, Australia *Email: suhlmann@nmsc.edu.au ABSTRACT: Six field experiments were performed to (1) quantify the scale loss and partitioned (immediate and short-term) mortality of key teleosts discarded from a penaeid seiner and trawler operating in 2 estuaries in southeastern Australia, and (2) assess the utility of modified operational and/or onboard handling procedures for maximising survival. For both gears, several non-target species were caught, handled and discarded according to 2 general categories of treatment (‘mild’ and ‘extreme’) representing the plausible limits of severity of commercial operations. The mild treatments involved the shortest conventional deployments of the gears followed by the immediate sorting of catches in water-filled trays, while the extreme treatments comprised the longest conventional deployments and sorting in dry trays. Discards were examined for immediate mortalities and scale loss before sorting onboard, while live individuals of key species, along with appropriate numbers of controls, were released into sea cages and monitored for mortalities up to 5 d. For both gears, there was a trend of higher percentages of immediate mortalities in the extreme treatments, and more scale loss from dead than live seined and trawled silver biddy Gerres subfasciatus, seined tarwhine Rhabdosargus sarba and trawled yellowfin bream Acanthopagrus australis. Despite considerable interspecific variabilities, few intraspecific differences were detected between treatments for the short-term mortalities of live discards; however, for all species, these deaths were greater than those incurred by the controls (most of which survived). The partitioned mortality estimates were combined to provide a range of total mortalities for seined (95.97 and 99.07%, respectively) and trawled (71.74 and 97.64%) G. subfasciatus, seined R. sarba (23.95 and 100%) and trawled southern herring Herklotsichthys castelnaui (100%) and A. australis (3.40 and 35.01%). Because most deaths occurred irrespective of onboard handling procedures, we conclude that simply reducing the duration of gear deployments would provide a first step toward mitigating discard mortality in these fisheries. KEY WORDS: Discards · Partitioned mortality · Penaeid fisheries · Catch volume · Unaccounted fishing mortality Full text in pdf format NextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in DAO Vol. 76, No. 3. Online publication date: July 16, 2007 Print ISSN: 0177-5103; Online ISSN: 1616-1580 Copyright © 2007 Inter-Research." @default.
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• W1975850808 title "Damage and partitioned mortality of teleosts discarded from two Australian penaeid fishing gears" @default.
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• W1975850808 doi "https://doi.org/10.3354/dao076173" @default.
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