07 tran van viet 3rd apr 2014
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Comparison of water quality in
rotation of shrimp - rice farming system
in Ca Mau and Tien Giang
provinces, Mekong delta, Vietnam
T. V. Viet(1), H.T. Giang(1), N.M.N.Quang(2) and V.N.Ut(1)
College of Aquaculture, Can Tho Univerisity, Vietnam
2
Agriculture Extension Center of Tien Giang province, Vietnam
1
1
Background
Area of aquaculture in the Mekong
delta and Vietnam
72,5 %
63,5 %
2
Background
Shrimp production from aquaculture
3
Background
- Export value from shrimp: 3.0 billions USD
in 2013 (VASEP, 2014)
- Mekong delta contributes over 70% of the
country
- Many systems:
+ Intensive
+ Semi-intensive
+ Integrated mangrove-shrimp farming
system
+ Rotation of rice shrimp farming system.
4
Rotation of rice shrimp farming
system
-This system only applies in the coastal
- where has freshwater in rainy and brackish water
in the dry seasons
Shrimp culture
Black tiger shrimp (Penaeus monodon)
Dry season salinity > 3ppt
Rice paddy
Rainy season: salinity < 3ppt
5
Diagram of the system in
the Mekong Delta
6
Seasonal for the farming system
Depend on: - Location
- Irrigational system of each region
- Freshwater source for rice growing
- Brackish water for shrimp culture
- Rainfall of year /weather
Water quality is fluctuated in both of temporal
and spatial
7
Contents of the study
-To assess water quality and yield ( shrimp)
in rotation of rice shrimp farming system
- To find out effect factors to shrimp culture
8
Methodology
-The study is carried
out in 2003
-Tan Phu Dong, Tien
Giang provinces (TG)
in Eastern of the MD
- Thoi Binh, Ca Mau
province (CM) in the
western of the MD
9
Experimental design in each province
Area of each from:0.5-2.4 ha
10
Sampling
(6 times for each farm)
Aug=1 st
Oct = 2nd
First two times
Early and late cropping
Jan=3rd
Feb= 4th
Mar=5th
Apr=6th
Last four times
Each time per month
11
Results
Aug Sept Oct
..
12
