Some developments in the tuna fisheries in the Indian Ocean
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The catch and effort data currently available for the Indian Ocean tuna fisheries are considered inadequate for stock assessment or purposes. The areas where most deficiencies occur were identified and it was concluded that a full-time data collation and evaluation service is required if the database is to be up-graded to the desired level. Recent data was obtained on the Indian Ocean long-line fishery and a serious decline in total catch and catch per unit of effort was detected and discussed. The current knowledge of the state of the stocks of each of the major tuna species exploited by long-lining was briefly reviewed. It was concluded that the total long-line catches of tuna in the Indian Ocean in 1973-74 probably reached maximum levels which may be greater than the total annual average in future years. The total 1975 catch was anticipated to be much lower than in previous years. The deterioration in the economics of long-lining in recent years indicates that a complete recovery of the industry is unlikely and the total tonnage of vessels employed in the industry in the Indian Ocean will probably not exceed that of 1973-74.