Abstract It was on Nov 19th 2005 that the Japanese Fishery Delegation announced in the annual conference of International Commission For The Conservation of Atlantic Tuna (ICCAT) that Taiwanese Atlantic Tuna Fishing Vessel Fleet laundered the fish at the high sea, violating the regulations on the Conservation of Tuna. As a result, they completely amputated the quota of tuna fish sales to Japan (quota) and cancelled the status of member nation in ICCAT. Finally, Taiwanese Fishery Delegation remained the member nation status unchanged after our efforts to explain the tough situation facing Taiwanese Tuna Fishing industry to Japan, but the quota was greatly downsized to 4,600 Metric Tons. Such severe action of revenge not only resulted in the complete collapse of Taiwan¡¦s Tuna Fishing activities in the Atlantic Ocean but also exposed Taiwanese Far Sea Fishing management to the International Fishery nations¡¦ practical competition crisis. The development of Taiwan¡¦s Far Sea Tuna Fishing Industry has extended across Tri-ocean. Taiwan has the most Tuna Long Liners, and our catches have exceeded those from some other countries, ranking No.1 in the world. Therefore, it has undeniably had a great influence on the development of some other nations¡¦ fishing industry. Moreover, Taiwanese fishing business owners have taken every opportunistic ways to sell the fish out of the quota to Japan. We were able to survive by good luck in the transitional period of fishing development before the year of 2000. But Tri-ocean Tuna Conservation Commissions have greatly increased the awareness of concept of Tuna Conservation in recent days, so it was unavoidable that they will impose as certain of regulations on the catch. If both Taiwan¡¦s government and fishing business owner don¡¦t find a solution to this sticky problem, it is just a matter of time that Taiwanese Long Liners will be evicted from Tri-Ocean. This research was started in the development process of Taiwan¡¦s Far Sea Tuna Industry, introducing the Tuna Conservation organizations of Tri-Ocean, (ICCAT, WCPFC, IATTC, IOTC, CCSBT), and the profiles on nutrition facts of Tuna Fish, fishing method and Fishing cooperation. This research also further groped and analyzed how both Taiwanese Fishing Authority and Fishing business owners reacted to the sanction pressure facing Taiwan in Tri-Ocean regions. This research will be used as the reference for both Taiwan¡¦s far sea Tuna Business owners and its decision-makers in face of meeting the severe pressure created by international quota. It will be instrumental to promoting Tuna fish consumption also. Keywords: Flag Of Convenience, Fishing Cooperation, Quota¡FTuna Long Liner, Sashimi Fishing Vessel.