How to use
Tab 1: Test zone closures
Allows for the exploration of trade-offs from user-defined zone closures. Explore % of fisheries revenue protected and % whale risk avoided under different management scenarios. To test a management scenario, select which zone/s and time-period to close, how much fisheries effort to displace, and then click Calculate Tradeoffs. For the selected inputs, returns:
Background information and definitions
Revenue - USD value of landings per grid cell using vessel monitoring system (VMS) data linked to California landings receipts registered to Dungeness crab (Samhouri et al., 2021).
Whale distributions - Modeled distributions for blue and humpback whales based on species distribution models (Abrahms et al., 2019; Samhouri et al., 2021).
What insights does it provide?
To allow for retrospective analysis on how enacting California Risk Assessment and Mitigation Program (RAMP) zone closures affects trade-offs between avoiding risk of whale entanglements in crab fishing gear and protecting crab fisheries revenue.
What is the Entanglement Tradeoffs app?
This dynamic app contains spatial information on the distributions of Dungeness crab fishery revenue, predicted humpback, and predicted blue whale distributions from November 2009 to April 2019, relative to the seven RAMP zones. This tool is based on Samhouri et al. (2021) and Welch et al. (2023).
Whale entanglement decision support tool
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