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  • 1
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    Multi-species fish stock assessment by acoustic method 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/26352 | 23782 | 2019-03-22 06:59:54 | 26352 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2021-07-24
    Description: Acoustic resource surveys were conducted by M/V SEAFDEC in the Gulf of Thailand and off the east coast of Peninsular Malaysia from September 5 to 28, 1995 for pre-NE monsoon season and from April 24 to May 17, 1996 for post-NE monsoon season, using the scientific echosounder FQ-70 (Furuno Electric Co.). Collected raw values of backscattering strength (SV) from the 200 kHz were carefully corrected and filtered to eliminate the influence of plankton. These corrected SV values were classified into pelagic and demersal fish, and were used to estimate the biomass of pelagic and demersal multispecies fish. Biomass of pelagic and demersal fish for each season was only estimated in the east coast of Peninsular Malaysia within Malaysian EEZ waters due to the availability of previous fisheries statistics and biological data. Dominant species were selected based on the fisheries statistics and landing place survey. Length (L) and weight were obtained from previous literatures. Target strength (TS) of these dominant species were calculated as TS =20 log (L) -66. The distribution of the SV values for pelagic fish showed a distinct difference between preand post- monsoon seasons. Greater concentrations of SVs were observed from offshore compared to the nearshore waters in pre-monsoon season. The distribution for the demersal fish showed that there was no clear difference between pre- and post-monsoon. The estimated biomass of multi-species fish off the east coast of Peninsular Malaysia within Malaysian EEZ for the pre-and post-monsoon seasons was 4.4x105 tonnes (2.3x105 tonnes of pelagic fish and 2.1x 105 tonnes of demersal fish) and 3.1x105 tonnes (1.9x105 tonnes of pelagic fish and 1.2x 105 tonnes of demersal fish), respectively.
    Keywords: Fisheries ; Pelagic fisheries ; Fishery surveys ; Stock assessment ; Demersal fisheries ; Echo surveys ; Multispecies fisheries ; South China Sea ; Gulf of Thailand ; Malaysia
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 336-346
    Format: 11
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  • 2
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    Multi species stock assessment by acoustic method in the South China Sea Area III: Western Philippines (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26254 | 2002 | 2019-03-01 06:36:07 | 26254 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-07-24
    Description: An acoustic resource survey off western Philippines waters from April 18 to May 07, 1998 was conducted by MFRDMD in collaboration with BFAR by using M/V SEAFDEC. A scientific echosounder FQ-70 developed by the Furuno Electric Co. of Japan was used to collect the SV data along the transects of 60 nautical miles apart. The raw data of backscattering strength (SV) collected from the 200 kHz transducer were carefully corrected and filtered to eliminate the influence of noises such as planktons. The corrected SV values were used to estimate the biomass of multi-species pelagic fish. Decapterus macrosoma was selected as representative species based on catch composition caught by M/V MAYA-MAYA during fishing operations. From the catch, the standard length (SL) and average weight of Decapterus macrosoma were obtained. Then the target strength (TS) of the representative species was calculated using formula, TS=20log (SL) - 66. The distribution of the SV values showed geographical difference. SV values were higher in the northern area and the southern waters of Manila. TS was estimated at -45.8 dB with the standard length of 10.2 cm. The estimated density and biomass of multispecies pelagics along the coastal waters were 18.9 tonnes/km2 and 1.672 million tonnes respectively. Meanwhile the total area and depth layer used were 88,362 km2 and 190 m respectively.
    Keywords: Fisheries ; Marine fisheries ; Stock assessment ; Echo surveys ; Multispecies fisheries ; Target strength ; South China Sea ; Philippines ; Decapterus macrosoma
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 1-10
    Format: 10
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  • 3
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    Stock assessment by hydro-acoustic method in the South China Sea Area II: Sabah, Sarawak, Brunei Darussalam (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26417 | 23782 | 2019-04-10 08:18:26 | 26417 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2021-07-24
    Description: Acoustic resource surveys were conducted by M/V SEAFDEC off Sarawak, Brunei and the east coast of Sabah from July 10 to August 2, 1996 for pre-NE monsoon season and from May 1 to May 24, 1997 for post-NE monsoon season, using the scientific echo sounder FQ-70, developed by Furuno Electric Co. Japan. Collected raw values of backscattering strength (SV) from the 200 kHz transducer were carefully corrected and filtered to eliminate the influence of plankton. These corrected SV values were divided into pelagic and demersal fish, and were used to estimate the biomass of pelagic and demersal multi-species in the limited coastal waters off Sarawak. Decapterus macrosoma for pelagic fish and Priacanthus macracanthus for demersal fish were selected as representative species, based on the fisheries statistics, landing place survey, and research vessel survey in order to estimate biomass. The standard length (SL) and weight of these representative species were obtained from research vessel survey and supported by previous literatures. Target strength (TS) of these representative species were calculated using formula TS = 20 log(SL) - 66. The distribution of the SV values for pelagic fish showed distinct difference between pre and post Northeast (NE) monsoon seasons along the coastal waters. Greater concentrations of SVs were observed from depth 100 and 200m on the continental shelf along the survey area for both the seasons. The estimated biomass of multi-species fish off coastal Sarawak waters for the pre and post NE monsoon seasons was 120,000 tonnes (100,000 tonnes of pelagic fish and 2x105 tonnes of demersal fish) and 470,000 tonnes (360,000 tonnes of pelagic fish and 110,000 tonnes of demersal fish), respectively. Estimated Maximum Sustainable Yield (MSY) was 83,000 tonnes for pelagic fish and 31,000 tonnes for demersal fish when using Cadima’s model.
    Keywords: Fisheries ; Oceanography ; Marine fisheries ; Pelagic fisheries ; Fishery surveys ; Stock assessment ; Demersal fisheries ; Echo surveys ; Fishery resources ; South China Sea ; Malaysia ; Sarawak ; Sabah ; Brunei Darussalam
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 338-352
    Format: 15
    Location Call Number Expected Availability
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