Title: Physico-chemical characteristics of the improved extensive shrimp farming system in the Mekong Delta of Vietnam
Authors: Tho, Nguyen ×
Ut, Vu Ngoc
Merckx, Roel #
Issue Date: 2011
Publisher: Blackwell Science
Series Title: Aquaculture Research vol:42 issue:11 pages:1600-1614
Abstract: Consecutive failure of the improved extensive shrimp
farming system has deterred the economy of some
coastal areas inVietnam. To investigate pond physicochemical
characteristics, a monitoring scheme was
performed in the Cai Nuoc district of Southern
Vietnam. Results show that the system was not optimal
for shrimps.While ponds were not contaminated
by organic loadings or major nutrients (N, P) and salinity
and pH were most optimal for shrimp, more than
37% of dissolved oxygen (DO) measurements were
lower than recommended. In the early morning
hours, DO measurements were even much lower
(0.84^2.20mg L1). Sulphate (SO4
2) concentrations
were most within the acceptable range. Total suspended
solids (TSS) were above the acceptable limit
(o50mg L1). Iron, alkalinityand hydrogen sulphide
were also higher than recommended. Pond sediment
was anaerobic (redox potential 422 to 105 mV)
and contained high amounts of organic matter (9.84^
21.96%). Lethal DO levels, high TSS and anoxic sediment
are the drawbacks in this system. Suggested
measures to improve pond conditions are (1) allowing
sedimentation before ¢lling culture ponds, (2) covering
dikes, (3) including no-culture breaks between
shrimp crops, (4) drying pond bottom, (5) removing
sediment and (6) controlling pond’s vegetation
ISSN: 1355-557X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division Soil and Water Management
× corresponding author
# (joint) last author

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