| Summary: | 碩士 === 國立臺灣海洋大學 === 海洋事務與資源管理研究所 === 96 === Total of 352 fishing operations of Nanfangao fishing vessels during February 2007 to April 2007 were recorded by the questionnaires. The catch damage rates by dolphins and sharks were 33.24% and 22.44%, respectively. The depredation rates in number and weight by dolphins were 10.20% and 9.52%, while those rates by sharks were 2.10% and 2.22%, respectively. Moreover, the depredation index by dolphins and sharks were 4.60 and 0.88. It also indicated that the dolphins preferred to bite dolphin fish, yellowfin tuna and bluefin tuna, however sharks preferred to bite dolphin fish, oil fish and billfsih. Based on the annual yields of Nanfangao longline fishery. The total depredation loss by dolphin and shark of Nanfangao longline fishery were respective NT 86,726,089 and NT 17,100,649 dollars, which occupied 9.08% and 1.79% of total income of Nanfangao longline fishery, respectively.
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