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  • Fisheries  (13,502)
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  • 1
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    Japan International Cooperation Agency
    Publication Date: 2019-01-28
    Description: The production from commercial and municipal fishing are presented for a period of 10 years showing a continuous increase. The commercial fishing production is broken down into production by major fishing grounds for a closer evaluation. The trend by type of fisheries for the same period is also presented. Purse seine and trawl fisheries show advancement with increase in production and number of fishing vessels in operation.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
    Format: application/pdf
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  • 2
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    Japan International Cooperation Agency
    Publication Date: 2019-01-28
    Description: An echo-sounder is an effective method of location and evaluation of fishing grounds, although its scope of coverage is narrow and the intensity of its echogram tracing as a means of estimating the size of fish schools is still a problem. Approximately 800 hours of echo-sounder recordings made in the South China Sea and Andaman Sea during the survey cruises of R/V CHANGI from 1970 to March 1973 were analysed. The results show that there is a definite correlation between fish catch and the gradings of fishing grounds as evaluated from the echograms obtained from the same area. This is especially so in areas where the values of mean catch per hour are more than 200 kg. The presence of upwelling, current rip and boundary layer, important factors for the formation of good fishing grounds can be clearly detected by an echo-sounder. During drifting, the growing size of fish schools attracted to the vessel’s light in the hours of darkness, as appeared on the echogram, may indicate abundance of fish in that area. The different modes and types of fish schools of some large fishes are easily recognisable on the echograms.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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  • 3
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    Japan International Cooperation Agency
    Publication Date: 2019-01-28
    Description: Based on the catch statistic derived from the official returns which were offered from all Taiwan paired trawlers operated in the South China Sea, dating from 1969 to 1971, the author made an investigation on the species composition, the seasonal changes of the demersal fishes appeared in their catches. The magnitude and potential of the demersal fish resources in these areas have also been assessed.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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  • 4
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    Japan International Cooperation Agency
    Publication Date: 2019-01-28
    Description: Existing national marine fishery statistics and proposals for the improvement are reviewed under the following headings; (1) Definition of Catch (2) Measurement of Gross Tonnage (3) Standardization of National Statistical classifications i. Tonnage classification ii. Species classification iii. Fishing Gear Classification (4) Establishment of Fishing Area Classification in South China Sea Area (5) Types of Statistical Tables Required for International Comparison. In designing any statistical survey the first thing to do is (I) to establish clear definitions or concepts for survey items and classifications to be used in the survey and (2) to work out statistical tables which might well meet the requirements of users. These kinds of works are particularly important when international comparison of fishery statistics is required. Therefore, reviews and proposals hereunder are made along the above line with respect to some pertinent points.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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  • 5
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    Japan International Cooperation Agency
    Publication Date: 2019-01-28
    Description: The fishery resources of Vietnam have not been neither rationally managed nor exploited up to the present time. Fisheries organizations both on the government side and in the private sector were first established in 1957. Since then, fishery production has increased annually. The total catch in 1972 was 677.000 MT and if the rate of increased production can be mentioned is expected to reach about 1 million MT by 1975. With the gradual coming of peace, it can be expected for a variety of reasons that the fisheries of Vietnam will be expanded significantly and become a bigger contribution to our food supply as well as export production. At present, there are 340,000 fishermen operating 95,000 wooden fishing boats of which 55,000 are mechanized. The marine coastal area is intensively exploited by small boats while 20 large steel trawlers recently have begun to fish offshore. A joint project (UNDP-FAO and government of Vietnam) survey in the South China Sea and the Gulf of Thailand was set up 3 years ago and should continue to operate for some time to come. The inland fisheries, the production of which represents one sixth of the total annual catch, is carried out in rivers, streams and flooded areas in the Mekong delta and also by fish culture in fresh water and brackish water ponds and in floating cages in rivers. With improved methods of aquaculture the yield of fish ponds increases constantly. With a rapid expansion of the commercial fisheries, and rapid increases in exports, which tend to be concentrated on a few high value species, there may be a danger of over-exploitation in one area or another. There is also a danger that investment in plants, fleets, and shore facilities may be improperly timed and inefficiently utilized. Therefore, a thorough basic study of the entire commercial fisheries is needed, and a well coordinated plan for investment and development made. Plans are now being made to accomplish this important objective.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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  • 6
    Publication Date: 2019-01-28
    Description: The paper presents the research activities of the Marine Fisheries Research Department of the Southeast Asian Fisheries Development Center. The results of the Department's trawl fishing activities, longline and vertical handline operations, tuna longline operations and oceanographic observations were also presented. Also presented in the paper are the future plans of the Department.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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  • 7
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    Japan International Cooperation Agency
    Publication Date: 2019-01-28
    Description: The semi-commercial bottom trawl fishing by the training vessel JURONG in the South China Sea in 1971 and 1972 was confined to three areas at its south western portion. The positively skewed frequency distributions of catch per hour assumed approximately the shape of a normal curve when the yield was transformed logarithmically. Sample statistics from these transformed values form the basis of discussion of the yields for 1971 and 1972 in relation to fishing seasons and types of nets used. Yield records from JURONG showed that the catch in waters off Terengganu (northeast coast of West Malaysia) was poorer than that of Homan and Sarawak. These yields were briefly discussed together with values obtained by the R/V CHANGI. In the area off Sarawak, the Engel II net obtained much better catches than the four seam net. The percentage composition of dominant fish categories from Tioman and Sarawak are also discussed.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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  • 8
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    Japan International Cooperation Agency
    Publication Date: 2019-01-28
    Description: A preliminary study was made on oceanographic conditions in the South China Sea, using the data collected over two monsoon seasons. In the northeast monsoon and the subsequent stagnant season, a narrow belt-like water mass of high temperature and low salinity was observed along the east coast of the Malay Peninsula. While in the southwest monsoon season, the existence of this water mass was not clear. The presence of this narrow belt of water mass suggest the existence of a southward-flowing current which may play a role in transporting the water from the Gulf of Thailand to the coastal area of the Peninsula.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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  • 9
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    Japan International Cooperation Agency
    Publication Date: 2019-01-28
    Description: During the experimental bottom long line fishing conducted in June and September, 1972, near the Gulf of Thailand and off Kuching, Sarawak respectively, simultaneous oceanographic surveys were also carried out. The analysis of the data suggested possible relation between oceanographic and fishing conditions. Throughout the two trips it was a common feature that good catches were often obtained near the boundary between the nearshore warm water and the deeper cold water. Through oceanographical consideration of the data obtained, the following conclusion was deduced. There is a possibility that good fishing grounds are located along the canyon off Kuching throughout all seasons. However, their locations may be altered with the change of oceanographic conditions. In the area off the Gulf of Thailand, good fishing grounds may be formed only in certain specific seasons.
    Keywords: Fisheries ; Oceanography
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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  • 10
    Publication Date: 2019-01-28
    Description: Presented in this paper is the report of the research cruise for trawl fishing ground in the northern area of the South China Sea between the margin mainland China continental shelf and continental slope. The cruise reported the water quality and topographical characteristics of the slope that might affect the abundance of fishes. Likewise, fishes that were caught during cruise were also documented.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Book Section , NonPeerReviewed
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