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    Historical trends of tuna catches in the world 2004
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    This paper reviews historical trends of the catches of the major commercial species (albacore, bigeye, bluefin, skipjack, and yellowfin) of tunas. The total world catch of these species has increased during the last 50 years (from 0.4 to 3.9 million MT), but the pattern of increase has varied among species, oceans and fishing gears. The causes of those variations are analyzed in this paper. In the world catch, the Pacific Ocean has been predominant throughout. In recent years catches from of the Indian Ocean have exceeded those of the Atlantic. Skipjack and yellowfin catches have shown a rapid increase. Bigeye catches also showed a constant increase, but at a lower level. The catches of albacore, bluefin and southern bluefin tunas have been stable or have decreased in recent years. The baitboat fishery took the greatest proportion of the total catches during the 1950s. However, the catch of the purse-seine fishery, became significant in the late 1950s, and became dominant by 1990. Lon gline catches started picking up in the late 1950s, increased until the 1990s and thereafter declined.

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