1. CATCH LIMITS FOR INDIVIDUAL PURSE-SEINE VESSELS TO REDUCE FISHING MORTALITY ON BIGEYE TUNA IN THE EASTERN PACIFIC OCEAN.

2. Methods Based on trip records Data for each vessel is summed to provide total catch of bigeye, yellowfin, and skipjack for each year for each vessel. 1) Determine the number of vessels that capture the majority of bigeye catch. –Order the data by descending catch of bigeye. 2) Investigate individual vessel catch limits. –Assuming that catch occurs at a constant rate throughout the year –Fishing stops as soon as the bigeye limit is taken.

3. Number of vessels that capture the majority of bigeye

4. Catch of other species

5. Number of vessels that capture the majority of bigeye 50% of the BET catch75% of the BET catch Vessels%BET%YFT%SKJVessels%BET%YFT%SKJ 1999145152631751149 200011515202376834 2001155163227751050 20021250324 75545 200315524253076941 2004155152430751039 2005125341825761032

6. Vessel limits 2004 2005

7. Vessel limits – 50% bigeye reduction LimitVesselsLost catch % 19993503919 20008893017 20014743116 20024593012 20034163816 20044543717 20055203316

8. Vessel limits – 30% bigeye reduction LimitVesselsLost catch % 19996601810 20001520199 2001790269 2002780207 2003730228 20048202310 2005930168