Comparative statistical analysis of incidental dolphin mortality, during fishing trips of the Mexican purse seine tuna fishery in the Eastern Pacific Ocean recorded by two scientific observer programs

摘要

Scientific observer programs in fisheries are being deployed worldwide in order to obtain robust data for fishery studies,and in relation to its interaction with target and bycatch species. A comparison between two observer programs in Mexican purseseine tuna fishery in the Eastern Pacific Ocean is performed considering the incidental mortality per trip as a metric recorded by bothobservers programs from 1999 to 2016. A Bayesian t-test approximation was used for the comparison between the two methodssince, due to its probabilistic nature reduces uncertainty. The analysis showed a very low probability of differences for the estimatedbycatch rate between both programs.