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1、Fish aggregating deviceA fish aggregating (or aggregation) device (FAD) is a man-made object used to attract ocean going pelagic fish such as marlin（旗鱼）, tuna and dolphin fish. It usually consist of buoys or floats tethered to the ocean floor with concrete blocks. Over 300 species of fish gather aro

2、und FADs. FADs attract fish for numerous reasons that vary by species.The past and present of FAD They have been used for thousands of years in various forms. The earliest surface/midwater FADs were elements from nature such as driftwood and trees. Now surface and midwater artificial FADs are system

3、atically used in a large number of countries. IOTC-Indian Ocean Tuna CommissionWCPFC-The Western and Central Pacific Fisheries CommissionIATTC- Inter-American Tropical Tuna CommissionICCAT-International Commission for the Conservation of Atlantic Tunas The purse seine（围网） industrys increasing depend

4、ence on drifting FADs is an emerging issue that must be urgently addressed. While observed FAD deployments have increased by more than 60 percent since 2006 in the eastern Pacific Ocean aloneCombining these pieces of information on vessel numbers（船数量） and FAD usage produced a total estimate of approximately 105,000 drifting

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