North West Shelf Joint Environmental Management Study:InVitro Inputs - Fin fish population dynamics

Fish population dynamics are represented by age-structured models that account for reproduction, natural mortality and fishing mortality. These models are calibrated for the major species groups and are detailed in Sections 3 and 15 in the companion model specification report (Gray et al. 2006). The selection of the parameters for each species was done by running the historical period of the model over a range of values of these parameters, and comparing the initial biomass of the simulation to a range of species biomass that was thought to occur in nature. Parameters were selected at three levels within this range of biomass to give the optimistic, base-case and pessimistic specifications.

鱼类种群动态采用年龄结构模型进行表征，该模型涵盖繁殖、自然死亡与捕捞死亡等核心过程。上述模型已针对主要物种类群完成校准，相关细节可参阅配套模型规范报告（Gray et al. 2006）的第3节与第15节。各物种类别的参数筛选流程如下：在参数的取值范围内运行模型的历史模拟时段，将模拟所得的初始生物量与学界公认符合自然状态的物种生物量区间进行比对。最终在该生物量区间内选取三类参数水平，分别对应乐观、基准及悲观三种模型设定方案。