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![Page 1: Thailand Fisheries Development - ICEM · Reservoir fisheries - Several other thousand small dams and weirs - Impact of dams on river and floodplain fish production but offer reservoir](https://reader030.fdocuments.us/reader030/viewer/2022021801/5b50c0487f8b9a256e8f070f/html5/thumbnails/1.jpg)
MRC SEA OF HYDROPOWER ON THE MEKONG MAINSTREAM
THAI NATIONAL SCOPING WORKSHOP
14 August 2009
Bangkok, Thailand
Thailand Fisheries Development: Experience with reservoir fisheries, fish
passages and captive breeding, and use of
the Mekong for fisheries
Suchart Ingthamjitr
Programme Officer, Fisheries Programme
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Thailand fisheries development
Rice and fish are staple diets of Thai since in the past
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Reservoir fisheries
- Several other thousand small dams and weirs
- Impact of dams on river and floodplain fish production but
offer reservoir fisheries
- The major dams and reservoirs in the Mun/Chi watershed
completed before the year 1994 (MRC, 1997)
Name Primary purpose Year of
impoun-dment
Reservoir area at upper
storage level (km2)
Catchment area
(km2)
Ubolratana
Sirinthorn
Chulaporn
Lam Pao
Lam PhraPhloeng
Lam Takhong
Lam Nang Rong
Pak Mun
Hydroelectricity
Hydroelectricity
Hydroelectricity
Irrigation
Irrigation
Irrigation
Irrigation
Hydroelectricity
1965
1971
1972
1966
1973
1968
1968
1994
410
288
12
400
19
45
25
60
12,000
2,097
545
5,964
807
1,430
453
117,000
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Productions and composition
Variation of fish production and species composition in
different reservoirs depends on;
inhabited fishes in the river before impoundment,
aquatic ecosystem of the reservoir,
watershed and land use,
fisheries management such as fishing control and
stocking programme
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Ubolratana reservoir
before after remarks
no. of species 76 52
67-68
67
one year after imp.
After 6-8 years
1998-2000
Yield (kg/ha) 117.5 177.7
114, 172
40.5
one year after imp.
1975, 1982
1998-2000
Fish guild Carps ↓
Carnivores ↑
then plankton feeder and
herbivores
Change of fish after impoundment in 1965
Source: after Interim Committee for Coordination of Investigations of the Lower Mekong Basin, 1992
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Permanent loss species
in the reservoir
Labeo bicolor Kryptopterus cryptopterus
Wallagonia attu Kryptopterus apogon
Bagarius bagarius K. bleekeri
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1970 1973 1983 1992 2000
Number of fishing households
Number of fishing gear
- gill net
- lift net
- cast net
- dip net/scoop net
- hooks
1,060
12,320
68
195
NA
NA
1,379
7,850
159
67
98
20,730
3,905
14,485
1,279
542
812
1,865
4,870
31,160
448
NA
2,435
67,279
>5,000
39,860
790
3,050
1,700
64,250
population increased from 1,060 in 1970 to over 5,000
in 2000
majority is subsistence fishers use of gill net, lift net,
cast net, dip net/scoop net and hook, but gill net and
hooks are the most popular, use of gear varies seasonally
Study in 1998-2000
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found 67 species but only 21 economically
important species
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Fish ladder site
There are 8 fishways and mainly Pool and Weir design.
5 in the LMB
1 in the north
1 in the centre
1 in the south
Main fishes passing the fishways are River Carp (Cyprinidae) and Loaches (Cobitidae)
Fish passages
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Kwan Payao
Fishway
Nam Kam fishways
Pak Mun fishway
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LESSONS LEARNT FROM
FISHWAYS IN THAILAND
The fishways were not the best pool-type design for tropical species, a vertical slot design is more effective.
Pak Mun is too high for a pool-type fishway.
Fishways need to be built as part of fish passage planning.
Regular monitoring is needed to show the effectiveness of any fishways. And how to monitor properly?
We have a law, and a policy but not a clear implementation.
Cooperation is poor among agencies who are involved in water management and no co-operation at all for local authority and local communities, especially in managing fishway activities.
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Captive breeding
Has long been developed
16 fisheries stations/centre throughout Thai Mekong River Basin
produced about 600-700 x106 annually;
- 550 million fish fries and 100 million giant prawn
- indigenous : exotic species = 70% : 30%
- releasing : aquaculture = 95% : 5 %
Cooperation and assistance from
abroad and international organizations
encourage development
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Successful bred indigenous fishes
Pangasianodon gigas
Pangasianodon hypophthalmus Kryptopterus bleekeri
Labeo chrysophekadion
Pangasius sanitwongseiWallago leeri
Micronema apogon
Catlocarpio siamensis
Probarbus jullieni
Bagariys bagarius
Hemibagrus wyckioidesMystus filamentus
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Thailand’s use of the
Mekong for fisheries
The major fisheries activities in
Thai-Mekong Basin
- Giant catfish-Chiangrai
- Floodplain fisheries- Songkhram
- Cage fish culture-along the
Mekong, tributaries and reservoirs
Thai-Mekong boundary
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Giant catfish at Chiangrai
Spawning area
The 1st successful
breeding in 1983
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0
10
20
30
40
50
60
70
80
90
100
1970 1980 1990 2000 2010
Year
Catc
h (
nu
mb
er)
Reconstructed
Directly reported
Catch statistic and factor affecting on
population decreased
Mekong Giant Catfish Working Group
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Impact of Chinese dams on
fisheries at Chiangkong
- Unusual variation of water level
- fish production decrease
- investigation by scientific
approach
- demonstration of mobile hatchery
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Floodplain fisheries
Fisheries-dams related development
Floodplain fisheries at Songkhram
River Basin
- estimated prod. 22,000-26,000 tonnes/year
for food and income,
- concession fishing by auction system
Pak Mun dam
- decrease in fish production
- close and open sluice gates
- stocking programme
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Pak Mun dam sluce gates opened
Giant prawn in Pakse, Champasak
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Cage fish culture
Male tilapia cage culture in
the Mekong, its tributaries and
reservoirs
culture problems
- massive fish died
- low farm-gate price
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Thank you