Abundance index for longline fishery targeting spawning Pacific bluefin tuna Thunnus orientalis in south-western North Pacific Ocean.

The article reports on a study of the time-series catch per unit effort (CPUE) which can be used as an index of abundance for the Taiwanese fishery targeting spawning of Pacific bluefin tuna called Thunnus orientalis in south-western North Pacific Ocean. It collected and compiled Pacific bluefin tuna's daily catch data from auction records and time records of vessels at Tungkang port from 1999 to 2004. It used two criteria in screening the daily record namely catch with matching effort information for a vessel and time difference between date of auction and date of disembarking from port. It also used a generalized linear model (GLM) to remove the influential factors of each vessel trip.