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Fishing fleet heterogeneity and consistency Michael Robinson UCSB Geography.

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Presentation on theme: "Fishing fleet heterogeneity and consistency Michael Robinson UCSB Geography."— Presentation transcript:

1 Fishing fleet heterogeneity and consistency Michael Robinson UCSB Geography

2 Understanding fisherman behavior Fishing is fraught with physical and financial risk and is undertaken in a constantly changing environment. Effort distribution within a fleet appears to be far from homogenous. –Smith and Wilen 2003, Mistiaen and Strand 2000 Successful marine resource management requires an understanding of fisherman behavior. –Hilborn and Walters 1992

3 Fleet heterogeneity What do I mean by this? –Some fishermen are better than others –Individuals are (fairly) consistent over time –Fishermen in different “segments” of a fleet have some distinctly different characteristics and behaviors.

4 Are fishermen consistent? Ranking average yearly CPUE over time… * Fishermen with 6+ years of experience (from logbook data) Pounds of urchin per hour per diver (Percentile relative to the entire fleet)

5 Are fishermen consistent? Ranking average yearly CPUE over time… * Fishermen with 6+ years of experience (from logbook data) Pounds of urchin per hour per diver (Percentile relative to the entire fleet) Number of legals per trap (Percentile relative to the entire fleet)

6 Are fishermen consistent? Ranking average yearly CPUE over time… * Fishermen with 6+ years of experience (from logbook data) Number of legals per trap (Percentile relative to the entire fleet) Pounds per boat (Percentile relative to the entire fleet)

7 ANOVA results for fishing fleets divided into four categories based on average yearly CPUE ranks. Avg yearly CPUE ranks

8 Fishing fleet modeling Understand how “segments” within a fleet operate –Events per year, daily effort, catch per day Predict how fleets will be affected by and/or respond to changing environmental and biological issues Predict how fleets will be affected by and/or respond to changing management policies

9 THE END


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