New Zealand Journal of Marine and Freshwater Research abstracts

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A stock reduction analysis of Bay of Plenty snapper

D. J. GILBERT

Fisheries Research Centre Ministry of Agriculture and Fisheries P. O. Box 297, Wellington New Zealand

Abstract A general approach to stock modelling of fisheries when information is scanty is proposed, in which all available relevant information is utilised and in which parameters are examined over feasible ranges. Using it, a new stock reduction analysis (SRA) is developed which is analytically simpler than those previously developed. All four factors of biomass change (recruitment, growth, natural mortality, and fishing mortality) are model inputs. The growth factor is derived from length frequency samples and a growth curve. Feasible ranges for the parameters, together with ancillary information regarding the stock, define a feasible region on the parameter space. In this region maxima and minima for biomass, surplus production, and other variables are found. The model is applied to the snapper (Chrysophrys auratus) stock in Bay of Plenty, New Zealand.

Keywords stock reduction analysis; non-equilibrium population model; size specific vulnerability; stock biomass estimation; Chrysophrys auratus; Bay of Plenty; snapper; modelling

New Zealand Journal of Marine and Freshwater Research, 1986, Vol. 20: 641-653 0Received 10 September 1985; accepted 25 February 1986

PDF file of entire paper: medium quality (987K); (scanned from paper original: notes about this process)

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