ANALYSIS OF SKIPJACK CATCH PER UNIT OF EFFORT (CPUE) Mark N

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ANALYSIS OF SKIPJACK CATCH PER UNIT OF EFFORT (CPUE) Mark N ANALYSIS OF SKIPJACK CATCH PER UNIT OF EFFORT (CPUE) Mark N. Maunder and Simon D. Hoyle

Goal: Develop an index of relative abundance from purse seine catch and effort data on floating objects Problem: Catch per set is not related to abundance and there is no reliable measure of search time Concept: The temporal change in the ratio of one species to another in a set is the same as in the population

Main assumption

The data Unknown Known from catch data Stock assessment of species B

GLM approach Known abundance Temporal Effect as offset (i.e. index of relative abundance)

Test Species of interest: Yellowfin Species of known abundance: Bigeye Compare with yellowfin stock assessment estimates of abundance

Application Species of interest: Skipjack Species of known abundance: Bigeye Explanatory variables Time in months Latitude Longitude Sea-surface temperature Vessel

Yellowfin results: ratio of YFT to BET

Yellowfin results: Adjusted by BET known abundance

Yellowfin results: Full GLM

Skipjack results

Discussion The yellowfin test did not validate the method The known bigeye tuna abundance off set or the GLM did not greatly change the index of relative abundance The estimated indices of relative abundance are consistent with previous stock assessments and show no major concern for the population

Future work Incorporate spatial structure or fish size into the analysis Include other explanatory variables in the analysis (e.g. the catch of other species). Apply the method to other species