. Pesca commerciale di revisione. La pesca e il commercio di pesce. 28. Fig. 2 -catture al giorno, la pesca con reti a circuizione che effettuano sbarchi a Pointe-Noire (1967). c 5 5 r " 4 . ^ V E y s o T 2 y D. J. 1 J 0 1 1 1 1 F M A M J J A s 0 N D Fig, 3 • Catture per giornata di pesca, live-esca barche in atterraggio a Pointe-noire (1964-67 lisciata media). Un confronto della buona West African zone di pesca con la superficie media tem- peratures mostra un chiaro rapporto tra le aree di buona pesca e il 24° C. e 250 C. (circa 750-770 F.) isoterme. La relazione è coerente con i rapporti dei ricercatori francesi a Pointe-Noire

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. Commercial fisheries review. Fisheries; Fish trade. 28. Fig. 2 -Catch per day fishing, seiners landing at Pointe-Noire (1967). c 5 5 r « 4 . ^ V E y s o T 2 y Q. J. 1 J 0 1 1 I 1 F M A M J J A s 0 N D Fig, 3 • Catch per day fishing, live-bait boats landing at Pointe- Noire (1964-67 smoothed average). A comparison of the good west African fishing areas with the average surface tem- peratures shows an apparent relation between the areas of good fishing and the 24° C. and 250 C. (roughly 750-770 F.) isotherms. The relation is consistent with reports of the French researchers at Pointe-Noire (Congo). They have mentioned frequently that the "Berrit Front, " identified with the 240 C. iso- therm moving from just south of the equator in July to about I30 S. in January, appears to be a concentrating mechanism for tunas. The Tropical Atlantic Biological Labora- tory, a research unit of the Bureau of Com- mercial Fisheries, has been carrying on stud- ies of tuna biology and oceanography in the easterntropical Atlantic since 19 63. In 1968, the research vessel 'Undaunted' made two cruises to the area (January-May and August- December). We were particularly interested in the distribution and abundance of tuna schools and the relation of tuna to such factors as thermocline depth and water temperature. Some of the information gathered on these cruises is included in this report. Interest by the U.S. tuna fleet in the east- ern tropical Atlantic surface fishery height- ened in the summer of 1969. This was due to the closure of the eastern tropical Pacific fishery in mid-April, and the success of U.S. seiners in the Atlantic in 1967 and 1968. As a result, the U.S. fleet operating in the east- ern tropical Atlantic increased to over 20 seiners in 1969. Three Panamanian seiners and two Canadian seiners joined the Gulf of Guinea fishery this year. The Japanese government licensed three more purse sein- ers for the area in early 1969, bringing the total of Japanese se

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• bookcentury1900
• booksubjectfisheries
• booksubjectfishtrade
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