North West Shelf Joint Environmental Management Study:InVitro Inputs - Prawn biomass estimates

The initial conditions and carrying capacity estimates for the prawn stocks in NWS InVitro were calculated using catch data and biological information taken from the WA Department of Fisheries (2002) submission to Environment Australia regarding the Exmouth Gulf Prawn Fishery. This information was converted to total stock sizes using the assessment rule of thumb that catch at Maximum Sustainable Yield equals 12% of virgin biomass and cross checked using the methods outlined in Taylor and Dichmont (2001). This resulted in an upper bound on the estimate of maximum total biomass of 15000t for western king prawns, with a lower bound of 8000t and a median of 12000t. For the banana prawns the upper bound on biomass was again 15000t, but the lower bound was 4000t and the median was 8000t. All other prawn biological parameters were based on Kailola et al. (1993) and Taylor and Dichmont (2001).

本研究针对NWS InVitro海域虾类种群的初始条件与环境容纳量估算值，依托西澳渔业部（WA Department of Fisheries）2002年提交给澳大利亚环境署（Environment Australia）的埃克斯茅斯湾虾渔场相关报告中的捕捞数据与生物学信息计算得出。研究采用"最大可持续产量（Maximum Sustainable Yield）下的捕捞量占未开发生物量的12%"这一经验评估准则，将前述数据转换为种群总规模，并通过Taylor与Dichmont（2001）提出的方法完成交叉验证。据此，西澳王虾的最大总生物量估算区间为：上限15000吨，下限8000吨，中位数12000吨。针对香蕉虾，其生物量估算上限仍为15000吨，下限为4000吨，中位数为8000吨。其余所有虾类生物学参数均参考Kailola等（1993）以及Taylor与Dichmont（2001）的研究成果。