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  • 1
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    The primary productivity in the South China Sea, Area III: Western Philippines (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26271 | 2002 | 2019-02-21 02:15:25 | 26271 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Description: In this paper the relative concentrations and vertical distributions of primary production were investigated off Western Philippines of the South China Sea during tradewinds from April 15 to May 11, 1998. Primary productivity measurements were conducted using conventional "light-and-dark bottle" oxygen method. The net primary production estimates at ten (10) different stations established between 19° 59.2'N, 119° 58.7'E and 11° 13.5'N, 118° 03.1'E ranged from 0.10 ~ 1.53 g C m-2 d1. The result suggests that the present net production estimates in the area is remarkably higher than the estimates from other parts of the South China Sea (viz., northern coastal waters off Taiwan and southwestern parts of the SCS which included marine waters of Thailand, Indonesia and Malaysia). The highest primary production occurred at the upper 60-m well-mixed layer of station 1 in the northwestern most part of the area. Results have shown that some other hydrographic and chemical parameters (viz., temperature, salinity, light and fluorescence) greatly complicate and may not coherent with the analyses of relative distribution and abundance of primary production in the area.
    Keywords: Fisheries ; Oceanography ; Phytoplankton ; Primary production ; South China Sea ; Philippines
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 235-250
    Format: 16
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  • 2
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    Catch of experimental longline, purse seine and handline in the South China Sea, Area III: Western Philippines (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26260 | 2002 | 2019-03-01 05:49:00 | 26260 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Description: This paper presents the tuna longline fishing operation conducted in western Philippine waters as well as the port sampling conducted in Zambales. The longline fishing operation was not successful in catching tuna but caught the deep swimming species such as sharks, lancet fish and opah. The undefined and shallow thermocline might have contributed to the unsuccessful fishing operations. Another reason might be the spatial distribution of tunas brought about by the El Niño event, which causes the spreading of the warm water mass from the western Pacific Ocean to the eastern Pacific Ocean allowing the yellowfin tunas to have a wider space to move. Yellowfin tuna stock in the western Philippine waters belongs to the juvenile and subadult population while the skipjack tunas belong to the adult population as most of the catch observed during port sampling were mature. The juvenile and sub-adult stages of yellowfin tunas were not the proper size for the longline fishery, which may explain in part why no tuna was caught during the research cruise. These sizes are available principally to the purse seine fishery as observed in the port sampling survey.
    Keywords: Fisheries ; Handlining ; Purse seining ; Catch composition ; Fishery surveys ; Experimental fishing ; Longlining ; Tuna fisheries ; South China Sea ; Philippines ; Thunnus albacares ; Euthynnus pelamis
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 65-75
    Format: 11
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  • 3
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    The establishment of the Philippine Aquatic Sciences and Fisheries Information System (PASFIS) (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26360 | 23782 | 2019-04-02 03:35:39 | 26360 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Keywords: Fisheries ; Information Management ; Information systems ; Information handling ; Information services ; Information centres ; Aquatic sciences ; Fisheries ; Philippines
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 93-103
    Format: 11
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  • 4
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    The fisheries information service of RAPA (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26363 | 23782 | 2019-04-03 08:15:44 | 26363 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Keywords: Fisheries ; Information Management ; Fishery data ; Documents ; Libraries ; Data collections ; Information services
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 125-129
    Format: 5
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  • 5
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    Species composition, abundance and biomass distribution of zoobenthos in Vietnamese waters (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26379 | 23782 | 2019-04-05 08:42:20 | 26379 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Description: The benthic invertebrate (zoobenthos) fauna in Vietnamese seawaters was surveyed in April - May, 1999. Zoobenthos specimen were sampled by Smith-McIntyre grab on 38 stations and 180 species were recorded and composed of 5 major groups: Polychaeta, Crustacea, Mollusca, Echinodermata and others. The total of density and biomass zoobenthos in Vietnamese seawaters was 156.7 ind/m2 and 5943.0 mg/m2 respectively. Polychaeta and Mollusca were groups with the highest abundance in every cases considered. The remaining groups of zoobenthos such as Crustacea and Echinodermata which were lower in abundance but higher in biomass. There was a remarkable variation of zoobenthos both in species composition and density with the depth, substrate and spatial distribution. Abundance was higher in some subjects considered such as: in depth of 0 - 60m or in types of sandy components or in the Tonkin gulf and the Southeast regions. All diversity indices shown that water quantity in Vietnamese sea offshore in survey time was just satisfactory and good.
    Keywords: Fisheries ; Oceanography ; Geographical distribution ; Community composition ; Species diversity ; Abundance ; Check lists ; Zoobenthos ; Viet Nam
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 55-76
    Format: 22
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  • 6
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    Analysis and pre-estimation of nutrients in Vietnamese waters (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26390 | 23782 | 2019-04-08 06:24:56 | 26390 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Description: The distribution of nutrients (Silica, Phosphate, Ammonium, Nitrate, Nitrite and Sulfate) in the Vietnamese waters was studied in the SEAFDEC Interdepartmental Collaborative Research Survey: Area IV. The samples were collected by M.V. SEAFDEC on the 30 April to 29 May 1999 (post monsoon period). Fifty-eight stations (2m from surface and 100 m from surface) were established in this study. The average of Silica at the surface layer is 25.96μM and at the bottom layer is 30.69μM. The average of Phosphate at the surface layer is 0.890 μM and at the bottom layer is 1.353μM. The average of Ammonium at the surface layer is 2.805μM and at the bottom layer is 2.538μM. The average of Nitrate at the surface layer is 5.593μM and at the bottom layer is 6.810μM. The average of Nitrite at the surface layer is 0.169μM and at the bottom layer is 0.197µM. The average of Sulfate at the surface layer is 26.903 μM and at the bottom layer is 27.831μM. The results indicated that the concentrations of Silica, Phosphate, Nitrate, Nitrite and Sulfate in deep water were higher in the surface water, but the Ammonium is inverse.
    Keywords: Oceanography ; Research ; Phosphates ; Silica ; Nitrites ; Nitrates ; Marine environment ; Ammonia ; Nutrients (mineral) ; Sulphates ; Viet Nam ; South China Sea
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 310-345
    Format: 36
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  • 7
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    Studies on phytoplankton pigments: chlorophyll, total carotenoids and degradation products in Vietnamese waters (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26386 | 23782 | 2019-04-05 08:35:51 | 26386 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Description: Distribution of phytoplankton pigments was investigated in the relation to Chlorophyll a (Chl-a) and light intensity in Vietnamese waters located at longitude 102E - 112W, latitute 23N - 7N. Over 200 samples collected at 58 stations were analyzed for pigments (Chlorophyll a, b, c and carotenoids) and degradation products (Phaeophytill). Chlorophyll a was measured by fluorescence. Results show that average values in the seawater were 0.18 ± 0.04 mg.m-3 for Chl-a; 0.05 ± 0.01 mg.m-3 for Chl-b; 0.062 mg.m-3 for Phaeophytill. Higher value of Chl-a occurred at the thermocline but maxima were found at 75 or 50m depths. Average value of Carotenoids concentration was very low about 0.052 ± 0.12 mg.m-3. The report used a model for the relationship between Chlorophyll a content and light intensity to estimate the primary production. Average value of primary production was about 9.04 mgC.m3.day-1 at the surface and 2.63 mgC.m3.day-1 at the bottom. The relationship between Chlorophyll and some environmental parameters such as temperature, salinity was examined. The effects of thermocline and halocline to the primary production were analyzed.
    Keywords: Biology ; Oceanography ; Chlorophylls ; Photosynthetic pigments ; Phytoplankton ; Primary production ; Carotenoids ; Vertical profiles ; Viet Nam ; South China Sea
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 233-250
    Format: 18
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  • 8
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    Geotrophic and drift current in the South China Sea, Area IV: Vietnamese waters (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26393 | 23782 | 2019-04-08 06:53:08 | 26393 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Description: The water circulation in area IV was calculated by 2 methods. The circulation for the area where water depth exceeded 600m was calculated by the geostrophic balance method. In shallow water area effect of wind absolutely surpasses geostrophic balance, so wind induced drift current is greater than geostrophic current many times. So, for the whole area (shallow deep) the drift current was calculated by two-dimensional nonlinear shallow water equation based on typical monsoon fields. The results of 2 methods showed common picture of the circulation with divergence and convergence changing by season.
    Keywords: Oceanography ; Ocean currents ; Scientific research ; Geostrophic flow ; Geostrophic method ; Water circulation ; Wind-driven currents ; Viet Nam ; South China Sea
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 365-373
    Format: 9
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  • 9
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    Proceedings of the 4th Technical Seminar on Marine Fishery Resources Survey in the South China Sea, Area IV: Vietnamese Waters, 18-20 September 2000 (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26373 | 23782 | 2019-04-04 03:17:24 | 26373 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Description: This, the fourth in the series of Technical Seminars on Marine Resources Survey, continues the essential evaluation of marine resources available in the South China Sea. This latest seminar is an evaluation of the waters of Vietnam. In the series of surveys this is identified as Area IV, There are two vital results from the survey activities; the first of these is that the scope, species composition and biomass estimation of the regional waters are assessed. Secondly another aspect is emphasized, that of the element of cooperation between the nations of the region such that no one country is isolated.
    Keywords: Fisheries ; Viet Nam ; Living resources ; Marine fish ; Fishery surveys ; Check lists ; Biomass ; International cooperation
    Repository Name: AquaDocs
    Type: book
    Format: application/pdf
    Format: application/pdf
    Format: 434
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  • 10
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    Selective Fisheries Information Service Phase II: Project ADD (Analysis and Document Delivery) (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26371 | 23782 | 2019-04-04 01:28:43 | 26371 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Keywords: Fisheries ; Information Management ; Information services ; Information centres ; Information handling ; Information retrieval ; Information systems ; Documents
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 197-209
    Format: 13
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