Review of data collection and processing system, and revision of statistics for the Taiwanese deep-sea longline fishery operated in the Indian Ocean.
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Taiwan reorganized the catch statistics compiling group in 1996, with changes proposed in its data processing system. Through joint work between ICCAT experts and Taiwanese scientists, the system was carefully reviewed and verified. During the review, the need for revising the historical catch statistics was noted. The revision of Atlantic data was proposed and accepted by ICCAT in 1997. This paper gives the revision on Indian Ocean longline statistics with brief description on the new system. Major changes in total catches were due to the re-estimation of landings of bigeye and yellowfin tunas for six years based on Japanese import information, recovery of sales records of swordfish and application of conversion factors to processed weight reported previously. Major changes for catch/effort data were mainly due to detailed screening of the logbook data and recalculated new coverage rates. The size data for albacore, yellowfin, bigeye and swordfish were also carefully reviewed on boat-time basis and adjusted new size data sets have been created.