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Stock assessment of Queensland east coast school mackerel (Scomberomorus queenslandicus).

Lovett, R., Bessell-Browne, P., Litherland, L., Leigh, G., Campbell, A. and O'Neill, M.F. (2019) Stock assessment of Queensland east coast school mackerel (Scomberomorus queenslandicus). Technical Report. State of Queensland.

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Abstract

There has been no previous stock assessment for school mackerel. This stock assessment used an age structured model with a yearly time step and length based selectivity. Only the south-east stock was considered for assessment as harvests for the north-east stock were small. Data inputs included total harvest, standardised catch rates and age and length structures. The south-east coast stock model uses data from the 1988-89 to 2017-18 fishing years (comprising commercial harvest (1988-89 to 2017-18); recreational harvest (1994-95 to 2013-14); length structures (2014-15 to 2017-18) and age-length information (1991-92 to 1994-95)).

Model analyses suggested that biomass declined from the mid-2000s to around 65% of unfished biomass in 2017-18. Maximum sustainable yield (MSY) was estimated at 104–119 t per year, and the yield consistent with a biomass ratio of 60% was estimated at 84–95 t. The time series of harvests modelled may be underrepresented, causing an overestimate of the biomass ratio. Results reflect a low level of confidence, and precautionary interpretations are warranted.

Item Type:Monograph (Technical Report)
Corporate Creators:Department of Agriculture and Fisheries, Queensland
Business groups:Fisheries Queensland, Animal Science
Keywords:school mackerel, stock assessment, Queensland, fisheries
Subjects:Aquaculture and Fisheries > Fisheries
Aquaculture and Fisheries > Fisheries > Fishery resources
Aquaculture and Fisheries > Fisheries > Fishery for individual species
Deposited On:21 Nov 2019 04:57
Last Modified:21 Nov 2019 04:57

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