Monster Seminar JAM - No-take Zones as Optimal Fishery Management
Dr. James N. Sanchirico, Quality of the Environment Division, Resources for the Future
Discussions on the use of marine reserves (no-take zones) for fishery management are, for the most part, devoid of analyses that consider the ecological and economic effects simultaneously. To fill this gap, we develop a two patch ecological-economic model to investigate the effects of no-take zones on fishery profits. Because the fishery effects of reserves depend critically on the nature of the ecological connectivity, our model includes both juvenile and adult movement, with density dependence in settlement differentiating between the two types of dispersal. Rather than imposing a reserve on our system and measuring its effect on profits, we ask when does maximizing profits imply that a reserve should be created. Spatial fishery closures as an optimal solution are more likely to occur when the closed area is a net source of biomass and has higher costs of fishing or lower biological productivity, and are more likely for fish populations with density independent settlement ("adult movement") than with density dependent settlement ("larval dispersal").
Date and Time:
May 5, 2005,
11:00 am - 12:30 pm