Depletion Based Population Estimates for Western Rock Lobster

Depletion methods examine the decline in catch rate as catch is removed from a closed population. These methods provide a way to estimate original population size before fishing and the residual biomass after fishing and hence exploitation rate. This approach allows long-term changes in catchability and hence fishing efficiency to be assessed in the estimate of exploitation rate. The technique is applied to the western rock lobster fishery in Western Australia for the non-migrating part of the season, March to June. The trends in catchability, residual biomass and exploitation for three zones of the fishery since the 1984/85 season are examined.Time: completion June 2004

捕捞枯竭法（Depletion method）通过考察封闭种群中因捕捞移除个体后捕捞率的衰减趋势，开展相关评估工作。该类方法可用于估算捕捞前的初始种群规模、捕捞后的剩余生物量，进而推算捕捞开发率。此方法还可在开发率的估算过程中，对可捕性乃至捕捞效率的长期变化进行评估。
本技术被应用于西澳大利亚州的西部岩龙虾渔业，针对该渔季的非洄游时段（3月至6月）开展分析。研究同时考察了该渔业三个作业区自1984/85渔季以来，可捕性、剩余生物量以及开发率的变化趋势。
完成时间：2004年6月。