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  • 1
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    Regional survey of heavy metals in fish and fish products: Malaysia (2021)
    Marine Fisheries Research Department, Southeast Asian Fisheries Development Center | Singapore
    In:  http://aquaticcommons.org/id/eprint/26292 | 23782 | 2019-03-22 03:43:09 | 26292 | Southeast Asian Fisheries Development Center, Marine Fisheries Research Department
    Details
    Publication Date: 2022-08-02
    Keywords: Fisheries ; Malaysia ; Cadmium ; Lead ; Mercury ; Biological sampling ; Fish ; Fishery products ; Seafood
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 20-37
    Format: 18
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  • 2
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    Regional survey of pesticide residues in fish and fish products: Malaysia (2021)
    Marine Fisheries Research Department, Southeast Asian Fisheries Development Center | Singapore
    In:  http://aquaticcommons.org/id/eprint/26299 | 23782 | 2019-03-27 06:00:01 | 26299 | Southeast Asian Fisheries Development Center, Marine Fisheries Research Department
    Details
    Publication Date: 2022-08-02
    Keywords: Chemistry ; Fisheries ; Malaysia ; Pesticides ; Biological sampling ; Fish ; Fishery products ; Biochemical analysis ; Lethal limits
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 71-74
    Format: 4
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  • 3
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    Physical characteristics of watermass in the South China Sea, Area I: Gulf of Thailand and east coast of Peninsular Malaysia (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26320 | 23782 | 2019-03-27 07:10:12 | 26320 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2022-08-02
    Description: Our study provides new information on the physical characteristics of watermass in the South China Sea. We analyzed the temperature, salinity and density profiles to determine the effect of the NE monsoon on the variability of the physical properties of watermass, in the Gulf of Thailand and the east coast of Peninsular Malaysia. CTD data were obtained from both the M.V. SEAFDEC cruises conducted before (September 1995) and after (April 1996) the northeast (NE) monsoon season. We concluded that the NE monsoon caused the variability of the physical properties of watermasses, in the study area, slightly. We observed the movement of the thermocline, halocline and pycnocline layers from deeper depth to shallower depth, before and after the NE monsoon season, respectively. This movement indicates the possible occurrence of downwelling and upwelling processes in the region.
    Keywords: Oceanography ; Water masses ; CTD observations ; Physical oceanography ; Monsoons ; South China Sea ; Gulf of Thailand ; Malaysia
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-5
    Format: 5
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  • 4
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    Sedimentological characteristics of the sediments of the South China Sea, Area I: Gulf of Thailand and east coast of Peninsular Malaysia (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26323 | 23782 | 2019-03-28 08:22:52 | 26323 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2022-08-02
    Description: Two batches of eighty sediment samples were cut from the first centimeter of sediment cores collected during September 1995, representing the pre-monsoon period, and April 1996, representing the post-monsoon period, at the same location. The samples were collected within the waters of the Gulf of Thailand and the eastern board of Peninsular Malaysia. The sediment samples were analyzed for their sedimentological characteristics using the techniques of sieving and laser diffraction. In general the sediments of the Gulf of Thailand are finer, better sorted, more peaked than that of the Malaysian waters. Skewness of sediments from Thailand waters was more positively skewed than the Malaysian sediments for the pre-monsoon period but tended to be more negatively skewed for the post-monsoon period. It is also interesting to note that in general, the sediments collected during the post-monsoon period are finer, better sorted, more positively skewed and less peaked than the sediments collected during the pre-monsoon period. This is true for both the sediments collected from the Gulf of Thailand and the Malaysian waters. Near-shore sediments were also found to be the coarsest, followed by the off-shore sediments.
    Keywords: Oceanography ; Sediment sampling ; Sedimentology ; Sediment analysis ; South China Sea ; Gulf of Thailand ; Malaysia
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 34-53
    Format: 20
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  • 5
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    Trace metals concentrations and distributions in sea water of the South China Sea, Area II: Sabah, Sarawak and Brunei Darussalam (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26404 | 23782 | 2019-04-11 06:46:38 | 26404 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2022-08-02
    Description: Water samples off Sabah, Sarawak and Brunei Darussalam were collected during July–August 1996 and May 1997 and analyzed for dissolved and particulate cadmium, copper, iron, lead and nickel. Dissolved metals were coprecipitated with cobalt-APDC while particulate metals were digested with aqua regia and hydrofluoric acid. The concentrations of metals were measured using graphite furnace atomic absorption spectrophotometer. Concentrations of cadmium, copper, lead and nickel were in the same concentration ranges of unpolluted coastal water elsewhere except for some high concentrations of cadmium at some stations offshore. Iron concentrations were much higher than other regions, and the concentrations were about twenty times those found in the Gulf of Thailand and east coast of Malay Peninsula. High concentrations of these five metals in the offshore area in the July-August sampling possibly came from the Indonesian water flowing northward due to the influence of the wind from the south.
    Keywords: Oceanography ; Pollution monitoring ; Industrial wastes ; Marine pollution ; Heavy metals ; Coastal waters ; Trace metals ; South China Sea ; Malaysia ; Sarawak ; Sabah ; Brunei Darussalam
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 129-145
    Format: 17
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  • 6
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    Microplankton on distribution in the South China Sea, Area II: Sarawak, Sabah and Brunei Darussalam waters (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26411 | 23782 | 2019-04-10 07:46:55 | 26411 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2022-08-02
    Description: Collaborative cruises in the South China Sea around the coast of Sarawak, Brunei and Sabah were conducted in the pre-monsoon (October, 1996) and the post-monsoon (June, 1997) periods on board MV SEAFDEC. The microplankton from 79 sampling stations consisted of more than 200 taxa consisting predominantly of blue green algae (3 species), diatoms (〉 90 species), dinoflagellates (〉 70 species) and microzooplankton (〉 20 groups). Among the microplankton collected, three species of blue green (Trichodesmium erythraeum, T. thiebautii, Richelia sp.) and numerous diatom species were dominant. The dominant diatom species comprised of Chaetoceros diversum, C. peruvianum, C. laciniosus, Thalassionema frauenfeldii, Bacteriastrum comosun, Coscinodiscus sp. and Rhizosolenia alata; while those of dinoflagellates consisted of Ceratium fusus, C. arcuatum, C. teres, Protoperidinium sp., Protoceratium sp., Ceratocorys sp. and Alexandrium sp. The genera Chaetoceros, Rhizosolenia, Bacteriastrum and Ceratium were found to contain a wide range of species. The total microplankton densities ranged from 0.74 x 106 to 7.94 x 106 individuals / m3 and from 0.16 x 106 to 1.25 x 106 individuals / m3 during the premonsoon and postmonsoon periods respectively. The presence of the dinoflagellate species of Ceratium, Protoperidinium and Alexandrium were detected in considerable amounts at coastal and intermediate middle waters of the South China Sea. Blooms of Rhizosolenia alata and Trichodesmium sp. occurred during the premonsoon period. The microzooplankton consisted of more than 20 species dominated by copepod nauplii (〉 50% of total microzooplankton count), radiolerians, foraminiferas and protozoans; most of the zooplankton species were dominant in nearshore and intermediate middle waters of the South China Sea.
    Keywords: Oceanography ; Dominant species ; Species diversity ; Zooplankton ; Biological sampling ; South China Sea ; Malaysia ; Sarawak ; Sabah ; Brunei Darussalam ; Trichodesmium ; Bacillariophyta ; Trichodesmium thiebautii ; Richelia
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 197-223
    Format: 27
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  • 7
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    Trace metals in the surface sediments of the South China Sea, Area I: Gulf of Thailand and east coast of Peninsular Malaysia (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26325 | 23782 | 2019-03-28 08:20:36 | 26325 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2022-08-02
    Description: The trace metal distribution in the surface sediments of the Gulf of Thailand and the South China Sea were studied. Samples were obtained from two cruises of the MV SEAFDEC Total metal content were measured in the 63mm fraction of dried sediment. For the first cruise (Pre-Northeast monsoon) results, metal concentration ranges were between 0.41- 0.19mgg-1Cd, 10-36mgg-1Cu, 7.02-27.8mgg-1Pb, 15.3-352mgg-1Zn, 20.5-122mgg-1 Cr, 209-720mgg-1Mn, 0.79-5.96%Al and 0.71-2.82%Fe. Similar results were obtained for the second cruise (Post-Northeast monsoon) results, with metal concentrations in the range of 0.10-0.94 mgg-1Cd, 10.3-61.4 mgg-1Cu, 5.24-78.2 mgg-1Pb, 18.1-98 mgg-1Zn, 21.1-101 mgg-1Cr, 117-797 mgg-1Mn, 1.89-7.22 %Al and 0.70-2.38 %Fe. The concentrations of Al, Cr, Cu and Mn were significantly higher in the Gulf of Thailand in the pre-monsoon while concentrations of Fe, Cd and Zn were similar for both areas. For the postmonsoon Al, Cu and Mn concentrations were higher in Gulf sediments. Differences in metal concentrations were noted between the pre- and the post monsoon samples. Fe, Cr and Mn concentrations were generally higher in the pre-monsoon period for both areas but the distribution of Pb was higher in the post-monsoon while Zn and Cu distribution differed between the Gulf and the South China Sea areas. However normalisation of the metal data to aluminium content of the sediment showed generally uniform concentration of the metals studied over most of the area studied. Some enrichment by Cu in sediments from two sampling stations in the upper Gulf of Thailand is indicated by Cu:Al ratios exceeding normal crustal abundances of these metals. However low Cu:Al ratios in sediments from some areas of the South China Sea may indicate depletion of Cu in the sediments.
    Keywords: Oceanography ; Trace metals ; Sediment analysis ; Monsoons ; South China Sea ; Gulf of Thailand ; Malaysia
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 73-85
    Format: 13
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  • 8
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    Petroleum hydrocarbon in seawater and some sediments of the South China Sea, area I: Gulf of Thailand and east coast of Peninsular Malaysia (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26328 | 23782 | 2019-03-28 08:52:39 | 26328 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2022-08-02
    Description: Petroleum hydrocarbon in water samples and sediments collected during the Pre-Southwest Monsoon Cruise in the Gulf of Thailand and Eastern Peninsular Malaysia in April-May 1996 point out that land-based and sea-based sources were both important. High concentration (〉 0.5 mg/l) found in coastal water of the northern part and western part near Songkhla-Pattani could be derived from land-based sources. Elevated concentration of petroleum hydrocarbons in seawater and residuals in sediments of the central area of the Gulf could be originated from offshore activities. However physical oceanography of the Gulf could also play very important roles in redistribution, dispersion and accumulation of petroleum hydrocarbon in the water.
    Keywords: Oceanography ; Pollution ; Pollution monitoring ; Marine pollution ; Sediment analysis ; Petroleum hydrocarbonsSouth China Sea ; Gulf of Thailand ; Malaysia
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 105-110
    Format: 6
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  • 9
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    Dissolved carbonate-carbon dioxide in sea water of the South China Sea, Area II: Sabah, Sarawak and Brunei Darussalam (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26401 | 23782 | 2019-04-10 08:38:29 | 26401 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2022-08-02
    Description: Dissolved carbonate species in seawater are determined from pH and total alkalinity. The data clearly pointed out the significance of Rajang River as a source of organic matters that were subsequently decomposed and cause CO2 gas to evade from nearshore water in its vicinity into the atmosphere while most offshore surface water was the sink of atmospheric CO2. The total alkalinity profiles indicated dissolution of carbonate minerals, believed to be high magnesian calcite, below 500 m, which reinforce CO2 storing capacity of these waters.
    Keywords: Oceanography ; Dissolved inorganic carbon ; Carbonates ; Chemical oceanography ; Carbon dioxide ; South China Sea ; Malaysia ; Sarawak ; Sabah
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 62-94
    Format: 33
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  • 10
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    Primary production determination in the South China Sea, Area II: Sabah, Sarawak and Brunei Darussalam waters (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26407 | 23782 | 2019-04-11 07:04:56 | 26407 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2022-08-02
    Description: Primary production in the South China Sea, off Sabah, Sarawak and Brunei Darussalam was determined from in situ fluorescence, light intensity and the uptake of radioactive carbon incubation on the MV.SEAFDEC cruise in July-August, 1996. Depth integrated primary production varies between 0.13–0.88 gC/m2/day in the coastal zone and 0.23–0.89 gC/m2/day in the open sea. The magnitude was high along the north off Brunei Darussalam and Sabah and gradually decreased with depth. The elevated daily primary production was generally found at the sea surface mixed layer and subpycnocline chlorophyll maximum. The decreasing virtual light intensity was tending to restrict the vertical distribution in daily primary production with accompanied by the chlorophyll-a concentration.
    Keywords: Oceanography ; Chlorophylls ; Light intensity ; Fluorescence ; Primary production ; South China Sea ; Malaysia ; Sarawak ; Sabah ; Brunei Darussalam
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 165-176
    Format: 12
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