Proceedings of the Technical Seminar on South China Sea Fisheries Resources, Bangkok, Thailand, 21-25 May 1973http://hdl.handle.net/20.500.12066/39652024-03-28T22:38:40Z2024-03-28T22:38:40ZA rational survey method for evaluation of trawl fishing groundSuzuki, Otohikohttp://hdl.handle.net/20.500.12066/41292021-11-28T03:07:33Z1977-01-01T00:00:00ZA rational survey method for evaluation of trawl fishing ground
Suzuki, Otohiko
The paper presents a method by which the optimum number of hauls for an area can be estimated when the desired precision for estimating fish abundance is given. This method is applied to an area along the east coast Gulf of Thailand. The area was divided into three subareas according to the various features of fishing conditions. Subarea-I contains 13 blocks and is located in the southernmost part of the area; subarea-II comprises 17 blocks in the northernmost part and extends eastwards in the form of a rectangle. The remaining 31 blocks are contained in the subarea-III which occupy the intermediate and off-shore regions of the two subareas. The superiority of trawl fishing ground is in the order of the subareas II, I and III. If an error of 20% can be tolerated for the estimate of fish abundance, sixty hauls are necessary for subareas I and III, while thirty hauls are sufficient for subarea-II.
1977-01-01T00:00:00ZSome considerations of research and study on pelagic fishery resourcesKurogane, Kenjihttp://hdl.handle.net/20.500.12066/41282021-11-28T03:07:33Z1977-01-01T00:00:00ZSome considerations of research and study on pelagic fishery resources
Kurogane, Kenji
The approach to the stock assessment and fishery management is briefly described on the Indo-Pacific mackerel resource in the Gulf of Thailand and the yellowtail resource around the Pacific coast of Japan.
Recently, the fishery forecast has become one of the great concerns of Japanese researchers working on the pelagic fisheries. In addition to information concerning the stock assessment, knowledge on fish movements and aggregations connected with environmental conditions is accumulated to secure a correct forecast of fishery.
In spite of strenuous efforts of researchers, pelagic fishery such as natural fluctuation in fish abundance and catch, widely ranging movement and distribution and diversity of fishing gear etc., bring about many difficulties and problems on the block assessment, fishery management and forecast. At present, the results of studies are not always so reliable to satisfy the fishermen. Researchers, however, are endeavouring step by step to ensure correct and timely judgements on the above objects of fishery science with more intensive communication with fishermen.
1977-01-01T00:00:00ZTuna and tuna-like fish resources in the South China Sea and adjacent watersKikawa, Shojihttp://hdl.handle.net/20.500.12066/41272021-11-28T03:07:33Z1977-01-01T00:00:00ZTuna and tuna-like fish resources in the South China Sea and adjacent waters
Kikawa, Shoji
The distribution of tunas and billfishes in the South China Sea and the Southeast Asian waters was shown on the commercial longline data.
The seasonal changes in the hook-rate and the size composition of the yellowfin and bigeye tuna in the South China Sea were given and the previous suppositions on their stock structures in adjacent areas, the Indonesian waters and the Indian Ocean, were reviewed.
The estimated Japanese longline catches from the South China Sea attained their peak of about 6,800 tons in 1967 and since then they have fluctuated between 2,000 and 5,000 tons with somewhat downward trend. The yellowfin and bigeye tuna accounted for ninety percent of the Japanese catch more. The remainder was occupied by the billfish, mostly the blue marlin and black marlin. The total longline catch by the Japanese and Taiwanese fisheries from the South China Sea area were roughly estimated to be between 5,000 and 8,000 tons in a recent few years.
Among the small-sized tuna and tuna-like fishes, the skipjack, little tuna, longtail tuna, frigate mackerel and bonito seemed to be promising for their future exploitation. The biological information on some of them was briefly reviewed.
Recent activities in research on tuna fisheries in the Indo-Pacific areas (IPFC area) have been fully reviewed by Suda (1971). For the South China Sea area, however, little has been reported on the biology of large-sized tuna except a few studies (Nakamura, 1953), although this area has long supported the tuna longline fleets from Taiwan and Japan. The purposes of this paper are: (1) to show the distribution of tunas and billfishes caught by the Japanese commercial longline fishery in the South China Sea and its adjacent waters on the past data, (2) to show the recent trend in the longline catches from these areas and (3) to make a short review on the occurrence of small-sized tuna and tuna-like fishes in Southeast Asian waters.
1977-01-01T00:00:00ZA plan for the development of sea fisheries in the Philippineshttp://hdl.handle.net/20.500.12066/41262020-06-16T12:15:59Z1977-01-01T00:00:00ZA plan for the development of sea fisheries in the Philippines
The article presented the plans of the Philippine government for the improvement of the marine fisheries in the country. Production targets for every region are also presented. Moreover, the estimated cost for the implementation of the project is also presented.
1977-01-01T00:00:00Z