The paper entitled "Status of Fishery Exploitation and Potential Yield of Nerite Tuna in the South China Sea Region" (Annex 14) was the eleventh and was presented by Mr. The twelfth document touches on "Stock conditions in the region (Topics and analyzed data)" and was presented by dr.
ANNEXES
LIST OF PARTICIPANTS
Annex 2
OPENING ADDRESS
This step will further improve data exchange between MFRDMD and Member States and non-Member States. I am hopeful that this workshop will provide the impetus for what will ultimately be a successful program of cooperation, cooperation and mutual benefit among countries in the region.
AGENDA AND TIME TABLE
Annex 4
THE SECOND REGIONAL WORKSHOP ON SHARED STOCK IN THE SOUTH CHINA SEA AREA
COUNTRY STATUS REPORT
MALAYSIA
1) SARAWAK
STATUS REPORT
ROUND SCADS, MACKERELS AND NERITIC TUNAS FISHERY IN SARAWAK,
RICHARD RUMPET
STATUS REPORT: ROUND SCADS, MACKERELS AND NERITIC TUNAS FISHERY IN SARAWAK, MALAYSIA
- INTRODUCTION
- FISHERY STATUS 1. Landings trend
- STATUS OF EXPLOITATION AND POTENTIAL YIELD OF THE STOCKS
- BIOLOGICAL INFORMATION
- ACKNOWLEDGEMENT
- REFERENCES
- ANNEXE 5
- Annex 5
Preliminary studies on the Spanish barred mackerel Scomberomerus commerson (Lacepede, 1802) in the Gulf of Thailand. Chaayakul (1979) Population bioeconomics of Spanish mackerel, Scomberomerus commerson (Lacepede, 1802) in the Gulf of Thailand, Tech.
THE SECOND REGIONAL WORKSHOP ON SHARED STOCK IN THE SOUTH CHINA SEA AREA
2) SABAH
ON THE CURRENT STUDY OF SHARED FISH STOCKS IN SABAH,
MALAYSIA1
EDWARD ROONEY BIUSING
STATUS REPORT ON THE CURRENT STUDY OF SHARED FISH STOCKS IN SABAH, MALAYSIA1
EXECUTIVE SUMMARY
STATUS OF FISHERIES 1. Fishing Fleet
- Overview of the present marine Landings
- Pelagic landings in Sabah
- Tuna fisheries
- Mackerel fisheries
- Round scad fisheries
- Spanish mackerel fisheries
- Sardine fisheries
- Selar scad fisheries
- Hardtail scad fisheries
Other gears (hook and line, lifting nets, other seines, anchovy seines: in order of importance) each only contributed between 2-4% of total sea landings. The biological aspects of the population of hardtail scads on the west coast of Sabah sampled during the period 1992-1994 are given in Appendix 15.
RESEARCH STATUS
Regional breakdown of marine landings in Malaysia
Species breakdown of marine landings in Malaysia
Annual marine fish landings, Malaysia 1989-1993
Fishing fleet breakdown by GRT (gross tonnage) and gear type, Malaysia 1993
Fishing fleet breakdown by HP (horse power category) a. Inboard engined fishing vessels
Fishermen population breakdown by gear group, Malaysia Fishing region/
Summary of regional marine landings, Malaysia 1993
Summary of marine pelagic landings by gear type, Malaysia 1993 (metric ton)
Summary of marine pelagic landings by gear type, Sabah (metric ton)
Appendix 10: List of species currently covered by DGF Sabah fish stock assessment program
LENGTH FREQUENCY DISTRIBUTION OF FISH SAMPLES (BIOLOGICAL STUDIES) (RK = Rastrelliger kanagurta, RF = Rastrelliger faughni, RB = Rastrelliger brachysoma). LENGTH FREQUENCY DISTRIBUTION OF FISH SAMPLES (BIOLOGICAL STUDIES) (DR = Decapterus russelli, DMC = Decapterus macrosoma, DMR = Decapterus maruadsi).
Appendix 14: Biological aspects of Selar scad (Selar) stocks along the west coast of Sabah
Annex 6
3) PENINSULAR MALAYSIA
COUNTRY STATUS REPORT: PELAGIC FISHERY RESOURCE IN PENINSULAR MALAYSIA
SHAMSUDIN BIN BASIR
COUNTRY STATUS REPORT: PELAGIC FISHERY RESOURCE IN PENINSULAR MALAYSIA
- TOTAL ANNUAL PRODUCTION AND CATCH RATES
- LANDINGS PATTERN AND FISHING SEASON
- FISHING GEARS AND FISHING AREAS
- MAJOR PELAGIC SPECIES
- FISHERIES BIOLOGY
- OCEANOGRAPHICAL INFORMATIONS
- ANNEXE 7
Figure 6 shows the variation in monthly purse seiner catch rates at one of the landing centers on the west coast. On the east coast, most purse seines operate around FAD areas more than 20 nm offshore. Small pelagics caught with seine nets in west coast waters, mainly Euthynnus affinis, Thannus tonggol, Decapterus spp., Rastrelliger kanagurta.
However, in the waters of the west coast, Decapterus maruadsi appeared to be the most important and common species.
THE SECOND REGIONAL WORKSHOP ON SOUTH CHINA SEA AREA IN THE SOUTH CHINA SEA AREA.
PHILIPPINES
THE FISHERIES AND BIOLOGY OF ROUNDSCADS MACKERELS AND NERITIC TUNAS IN THE PHILIPPINES
FLERIDA M. ARCE and
CIELITO L. GONZALES
THE FISHERIES AND BIOLOGY OF ROUNDSCADS MACKERELS AND NERITIC TUNAS
IN THE PHILIPPINES
INTRODUCTION
FISHERIES AND BIOLOGY
Although these data are preliminary, variations in monthly total catch and CPUE for the two years may indicate the seasonality of the species. Landings of the two species of Auxis were not separated in the fishing statistics report. Landings of kawakawa are generally higher in shallow water than in deep water fishing grounds (Yesaki e t al, 1991).
The growth and mortality parameters of the round scad species in the Philippines are given in Table 12.
OCEANOGRAPHIC AND ENVIRONMENTAL PARAMETERS RELATED TO MARINE FISHERIES
The smallest mature and spent female Kawakawa found during the study were 40, 45 and 40 cm, respectively (Wade 1950b). Bunag (1956) measured the egg diameters of 30 fish (to determine maturity) and related egg development to different stages of maturity. Bunag (1956) concluded from the polymodal distribution of egg diameters that kawakawa spawned more than once during a spawning season, but was unable to determine spawning frequency.
RECOMMENDATIONS FOR COLLABORATIVE RESEARCH
An estimate of maximum sustainable yield and maximum economic rent from the Philippine small pelagic fishery. Preliminary stock assessment of the Danao purse seine fishery for tuna and small pelagics in the Camotes Sea, Central Visayas, Philippines. A contribution to the knowledge of the structure and composition of the water masses off the eastern Philippines.
A review of the Auxis fisheries of the Philippines and some aspects of the biology of frigate (A. thazard) and bullet (A. rochei) tuna in the Indo-Pacific region.
ANNEXE 8
THE SECOND REGIONAL WORKSHOP ON SHARED STOCK IN THE SOUTH CHINA SEA AREA
COUNTRY STATUS REPORT
BRUNEI DARUSSALAM
MACKERELS, ROUND SCADS AND NERITIC TUNAS FISHERIES OF
IDRIS HAJI ABD HAMID
MACKERELS, ROUND SCADS AND NERITIC TUNAS FISHERIES OF NEGARA BRUNEI DARUSSALAM
- FISHING GROUND AND TYPES OF GEAR EMPLOYED
- LANDING TRENDS, CATCH COMPOSITION AND SEASONALITY
- BIOLOGICAL, OCEANOGRAPHIC AND ENVIRONMENTAL PARAMETERS RELATED TO MARINE FISHERIES
- ANNEXE 9
- Annex 9
The majority of landings from 1989 to 1991 consisted of small mackerel (Rastrelliger kanagurta) and selar (Selar mate and Selar melanoptera). On the other hand, trawlers are not affected and the rest of the pelagic landings for 1994 were contributed by the artisanal sector. Figure 3 shows the density distribution of small pelagics on the Brunei continental shelf.
These values of Y/B indicate an overall easy exploitation of the pelagic resources in the onshelf area.
INDONESIA
THE DEVELOPMENT OF MARINE FISHERY IN THE SOUTH CHINA SEA AREA OF INDONESIA
I GEDE SEDANA MERTA SUBHAT NURHAKIM
THE DEVELOPMENT OF MARINE FISHERIES IN THE SOUTH CHINA SEA AREA OF INDONESIA
- THE EXISTING FISHERIES 1. Fishing Gears
- Production
- Level of Exploitation
- RESEARCH ACTIVITIES
- CONCLUSIONS
- ANNEXE 10
- Annex 10
Appendix Table 4 shows the total marine fisheries production by species group in the South China Sea Area (Jambi, South Sumatra and West Kalimantan Provinces) for 11-year periods. The results of the reassessment of marine fisheries potential in the South China Sea Area are shown in Table 2 (Venema, 1995). Appendix Table 1: Development of some main gears used in the South China Sea area, Year Payang Beach.
Appendix Table 4: Production of Marine Fisheries in Southern Part of South China Sea Area by Group of Species.
THAILAND
1) GULF OF THAILAND
THE OCCURRENCE OF NERITIC TUNAS (Auxis thazard AND Euthynus affinis)
AND OCEANOGRAPHIC PARAMETERS OBSERVED FROM PURSE SEINE SURVEY
Dhammasak Poreeyanond
- CATCH AND SPECIES COMPOSITION
- SIZE DISTRIBUTION
- OCEANOGRAPHIC OBSERVATION
- ANNEXE 11
- Annex 11
Neritic tuna is the most economically important pelagic fish in the Gulf of Thailand and the Andaman Sea. During the pre-monsoon season period (March-May) R/V "CHULABHORN" made cruises to conduct tuna purse seine survey using FADs moored in the Andaman Sea EEZ of Thailand. From the above data, it can be seen that during the months of March to May, the salinity in the Andaman Sea varied not more than 1 ppt.
From the results of the research of the Andaman Sea (Fig. 3-5), the thermocline zone, which most influenced the behavior of fish, was formed in the average layer from 20 to 170 m deep with a temperature ranging from 30.15° to 15.68° C.
THE SECOND REGIONAL WORKSHOP ON SHARED STOCK IN THE SOUTH CHINA SEA AREA
2) ANDAMAN SEA COAST OF THAILAND
STATUS OF PELAGIC FISHERIES ALONG THE ANDAMAN SEA COAST OF THAILAND
VEERA BOONRAGSA
ANNEXE 12
Annex 12
VIETNAM
SOME BIOLOGICAL PARAMETERS AND FISHERIES STATUS OF SHARED STOCK
Dr. NGUYEN PHI DINH
SOME BIOLOGICAL PARAMETERS AND FISHERIES
STATUS OF SHARED STOCK DECAPTERUS, RASTRELLIGER AND TUNAS IN COASTAL SEAWATERS OF VIETNAM
BIOLOGICAL PARAMETERS A. Round Scads Decapterus Maruadsi
Round scads belonging to the genus Decapterus in Vietnamese marine waters are represented by 4 species, namely: Decapterus maruadsi (White tip scad), D. maruadsi is the most common species. maruadsi are given as follows:. maruadsi is widely distributed in the marine waters of Vietnam and has been found in coastal areas from the Gulf of Tonkin to the Gulf of Thailand, mainly at depths of 30 - 60 meters. maruadsi caught by traditional pelagic fisheries have body lengths ranging from 60 to 239 mm, mainly from 120 to 189 mm. There are some differences in the length frequency distribution of fish caught during the northeast monsoon season and the southwest monsoon season. Echo chart recordings and catch composition of samples from the test fishery with bottom and pelagic trawls determined the day-night vertical migration of the D.
It was found from the bottom during the day and to the upper layers at night.
Mackerels Rastrelliger Kanagurta
By acoustic and swept area methods, the total biomass and total allowable catch (TAC) of D. Indian mackerel caught in the Vietnamese waters belonging to 4 age groups, of which two-year-old fish group is predominant and accounts for an average of 64.4%, one year old group accounted for 19.7%, three year old group - 12.0% and four year old group only 3.8%. kanagurta grew very fast in the first year, at the end of the first year the length of newly hatched R. kanagurta reached an average of 113 mm. March) until the end of the rainy season (October) with two peaks in March - June and September - October.
Tunas
- STATUS OF FISHERIES
- CONCLUSIONS AND RECOMMENDATIONS
- REFERENCES BUI DINH CHUNG, 1981
According to the results of the tuna driftnet catch, it was assumed that neritic tuna fishermen migrate from the off-shore areas of the South China Sea to the sea waters of the central areas of Vietnam in January - February. Roughly speaking, the total production of all species of tuna in Vietnam's seawater was estimated to be about 30,000 MT/year. Resources of shared stock in seawater in Vietnam have been mostly studied in coastal areas, while in off-shore areas few studies had been carried out.
BÙI ĐÌNH CHUNG, CHU TIẾN VINH, NGUYỄN HỮU ĐỨC, ĐÀO NHƯ Ý, 1991 Đánh giá trữ lượng các loài cá biển ở vùng biển Việt Nam.
ANNEXE 13
Annex 13
STATUS ON FISHERIES
EXPLOITATION AND POTENTIAL YIELD OF ROUND SCADS
AND MACKERELS IN THE REGION
HIROYUKI YANAGAWA
STATUS ON FISHERIES EXPLOITATION AND POTENTIAL YIELD OF ROUND SCADS AND MACKERELS IN THE REGION
MARINE PRODUCTION OF ROUND SCADS AND MACKERELS IN THE REGION
STATUS ON FISHERIES EXPLOITATION AND POTENTIAL PRODUCTION OF SCUD AND MACKEREL IN THE REGION. The unit price (catch value/catch quantity) of the three species groups in the region from 1976 to 1992 is shown in Table 3 and Figure 3. In the unit price of Indian mackerel in the region from 1976 to 1992, the price increased dramatically from US$ 0.48/kg.
On the Indo-Pacific mackerel unit price in the region from 1976 to 1992, the price showed less variation throughout this period with a minimum of USD 0.44/kn.
CATCHES OF ROUND SCADS AND MACKERELS BY TYPE OF FISHING GEAR
CATCH-EFFORT DATA ON ROUND SCADS AND MACKERELS
POTENTIAL YIELD
Therefore, it can be considered that there are certain possibilities of more increase of round shed catches in the region instead of the catches in and 1992 which are included in the potential yield zone. Therefore, it can be considered that there are certain possibilities of overexploitation of Indian mackerel in the region. On Indo-Pacific mackerel, the catches from 1982 to 1992 showed an increasing trend with some fluctuations below the potential yield zone (Fig. 16), on the other hand, the CPU values by ring signal from 1986 to 1990 showed a showed a decreasing trend (see Fig. 11).
Therefore, it can be assumed that there are some opportunities for overexploitation of Indo-Pacific mackerel even if catches are within the potential yield zone.
BIOLOGICAL INFORMATION
Estimated potential yield, recent three-year average and catch in 1992 for round mackerel, Indian mackerel and Indo-Pacific mackerel are shown in Table 14. In Indian mackerel, catches from 1983 to 1988 remained constant in the yield area of possible and then it showed an increasing trend until 1992 (Fig. 15), on the other hand, CPUE values by track from 1984 to 1990 showed a clear downward trend (see Fig. 8). Since the general consideration of the status of round mackerel, Indian mackerel and Indo-Pacific mackerel was described above on the basis of general fisheries statistics, more detailed examinations of the main species (group) should be done in the near future.
To carry out a detailed analysis, quality data on various fishery biological points for important species, more reliable catch and effort statistics etc. are needed. for the collection and exchange of information between researchers and the organizations concerned.
The price is that of production at the landing center (wholesale price). US$/Kg.) Year Grand Total Round Subtotal Indo-Pacific Indian Mackerel. Data were obtained from the west and east coasts of Peninsular Malaysia, Sabah, Visayas, Mindanao, the Gulf of Thailand and the Andaman Sea (data available were not always the same by year). Data were obtained from the west and east coasts of Peninsular Malaysia, Sarawak, Sabah, Visayas, the Gulf of Thailand and the Andaman Sea (data available were not always the same by year).
Data were obtained from Sabah, Visayas, Mindanao, Gulf of Thailand and Andaman Sea (available data were not always the same by year).
ANNEXE 14
Annex 14
STATUS ON FISHERIES
EXPLOITATION AND POTENTIAL YIELD OF NERITIC TUNAS
IN THE REGION
RAJA BIDIN BIN RAJA HASSAN and
MOHD TAUPEK BIN MOHD NASIR
STATUS ON FISHERIES EXPLOITATION AND POTENTIAL YIELD OF NERITIC TUNAS IN THE REGION OF
THE SOUTH CHINA SEA
- TUNA RESEARCH PROGRAMME
- National Projects
- Regional Projects
- TUNA FISHERIES IN THE REGION 1 The Fishing Season
- Fishing Gears
- Species Composition
- Biological Parameters
- STATUS OF TUNA STOCK AND ITS EXPLOITATION
- RECOMMENDATION
- ACKNOWLEDGEMENT
In the early 1980s, tuna fishing on the east coast of Peninsular Malaysia would normally show that Thunnus tonggol was the most dominant. This change in species composition was likely related to the change in the main fishing gear used for tuna fishing. In the Philippines, frigate and bullet tuna were the dominant tuna species, normally accounting for up to 45% of the catch (Barut, 1995).
These boats could fish in the waters of the Malaysian Exclusive Economic Zone.
