paitoon paewkhao patcharee puntuleng kamolrat phuttharaksa
TRANSCRIPT
Abundance and Distribution of Economic Fish Larvae
in the Gulf of Thailand and Andaman Sea
Abundance and Distribution of Economic Fish Larvae
in the Gulf of Thailand and Andaman Sea
By
Paitoon Paewkhao
Patcharee Puntuleng
Kamolrat Phuttharaksa
ObjectivesObjectives
1. To study on diversity, abundance anddistribution of fish larvae
1. To study on diversity, abundance anddistribution of fish larvae
2. To study on spawning and nursing ground ofeconomic fishes
2. To study on spawning and nursing ground ofeconomic fishes
Materials and MethodsMaterials and Methods1. Sampling region and PeriodThe survey on fish larvae was conducted at 72 stations of 3 areas:
-Upper Gulf of Thailand: 11 stationsSamples were collected 6 cruises in January, March, May, July, September and November 2004
4 cruises in January, March, July and August 2005. by R/V Pramong 2.
Materials and MethodsMaterials and Methods- Middle Gulf of Thailand : 21 stations
Samples were collected 4 cruises in January, March,
May and July 2005 by R/V Pramong 1.
- Andaman Sea: 42 stations
Samples were collected 4 cruises in January,
February, March, and April 2004 and 5 cruises
January, February, March, April and May 2005 by
R/V Pramong 4
Sampling stations
Seasonal closure areas
RayongPet Buri
Prachuap Kiri Khan
Phang-Nga
Phuket
Kribi
Trang
Satun
Surat Thani
ChumphonGulf of Thailand
Andaman Sea
Myanmar
Malaysia
12 34 5
6 78 9
10 1112 13
19
14 15 1617 1820
21 2223 24
25 2627 28
29 30 3132
1 2
3 4 5
6 7 8 910
11 12 1314
15 16 1718 1920 21 22 2324 25 2627 28 2930 31 32
33 34 3536 37 38
39 40 41
42
Chon Buri Thailand
Sampling method
1.Fish larvae collection• The plankton net use in sampling was a ring net 45,65
and 60 cm. mesh size 330 micrometer
• The oblique trawls at bottom to sea surface level were operated at speed 2-3 knots. Approximately 10 minutes/hual
• Samples were kept in 10 % sea-water formalin.
• Fish larvae were preserved in 4 % neutralized formalin solution.
Sampling method
2.Fish larvae identification • Specimens were identified to 5 family (Engraulidae,
Clupeidae, Carangidae, Nemipteridae and Scombridae)
• Calculating number of fish larvae per 1,000 m3
T = 1,000t / Vwhen T = number of fish larvae in 1,000 m3
t = number of fish larvae in the samplesV = volumn of water passed through the plankton net V = n*N1*a
when n = revolution number recorded by the current meter N1 = constant of displacement (m) per 1 revolution a = surface area of the net opening (m2)
ResultsResults
1. Abundance and distribution of economic fish larvae in the Gulf of Thailand
1.1 Upper Gulf of Thailand
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Engraulid larvae (ind./1,000 m3)
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Engraulid larvae (ind./1,000 m3)
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Clupeid larvae (ind./1,000 m3)
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1.2 Middle Gulf of Thailand
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Engraulid larvae(ind./1,000 m3)
seasonal closure area
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Clupeid larvae(ind./1,000 m3)
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2. Abundance and distribution of economic fish larvae in the Andaman Sea
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seasonal closure area
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seasonal closure areaCarangid larvae (ind./1,000 m3)
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seasonal closure areaNemipterid larvae
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seasonal closure areaScombrid larvae(ind./1,000 m3)
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SummarySummary
1. Abundance and distribution of economic fish larvae in the Gulf of Thailand
1.1 Upper Gulf of ThailandEngraulid larvae were the most abundant in March 2004, Clupeid and Scombrid were in September 2004. High distributions of those economic larvae in the upper Gulf were found in the area of Prachuap Kiri Khan Province
1.2 Middle Gulf of Thailand
Engraulid, Nemipterid and Scombrid were in January 2005, found in nearshore and offshore of Chumphon and Surat Thani Province
Clupeid and Carangid were in March 2005 in the area of Surat Thani Province.
1.2 Andaman Sea
Engraulid was found in March 2005, Clupeid, Nemipterid and Scombrid were in April 2005.The highest density of Carangid was in January 2005.
The Scombrid larvae were highly distributed between Koh Rok of Krabi Province and Adang-Rawi archipelago of Satun Province.
The others were found the most from Phang NgaBay of Phang Nga Province to Krabi Province.
Thank youThank you