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פותח על ידי קלירמאש פתרונות בע"מ -
Characterization of water quality in shrimp ponds of different sizes and with different management regimes using multivariate statistical analysis
Year:
2005
Source of publication :
Aquaculture International
Authors :
מילשטיין, אנה
;
.
Volume :
13
Co-Authors:
Milstein, A., Fish and Aquaculture Research Station, Dor M.P. Hof HaCarmel 30820, Israel
Islam, M.S., Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Wahab, M.A., Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Kamal, A.H.M., Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Dewan, S., Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Facilitators :
From page:
501
To page:
518
(
Total pages:
18
)
Abstract:
Coastal shrimp aquaculture in Bangladesh is mostly practiced in an agricultural unit called a Gher, which is a special type of agricultural field with elevated surrounding embankments/borders situated by the side of a river that is used to grow rice in winter and shrimp in summer. Ghers of different sizes are managed in different ways. An on-farm project was carried out to study the effects of Gher size and their related management practices on water quality, shrimp production and the economic returns of shrimp farming in the Southwest coastal region of Bangladesh. We present here the results of this project with respect to water quality as explored through factor analysis, which was applied as a way to understand the nature and extent of the effects of different variables. For the majority of the variables and factors, one-half to two-thirds of their variability was explained by changes over time (months), and a further one-quarter to one-third was explained by Gher size and associated management practices. The alternating dry/monsoon season and water management practices determined long-term and large-scale (annual) water exchange in the Ghers that mainly affected processes related to live and dead particles suspended in the water column. Processes related to decomposition and nitrification were more dependent on short-term (days) water circulation in the Ghers, which is turn was reliant on the time span between the exchanges of water in the Ghers and river. Our results show that improved management leads to higher natural and shrimp productivity in the smaller Ghers and strongly support the argument put forward by the policy makers and scientific community in Bangladesh that the smaller the Gher, the better they can be managed and the better the possibility of increased shrimp survival and production. © Springer Science+Business Media, Inc. 2005.
Note:
Related Files :
Asia
Decapoda (Crustacea)
Eurasia
multivariate analysis
pond culture
Pond management
shrimp culture
Shrimp ponds
עוד תגיות
תוכן קשור
More details
DOI :
10.1007/s10499-005-9001-6
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
22972
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:55
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Scientific Publication
Characterization of water quality in shrimp ponds of different sizes and with different management regimes using multivariate statistical analysis
13
Milstein, A., Fish and Aquaculture Research Station, Dor M.P. Hof HaCarmel 30820, Israel
Islam, M.S., Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Wahab, M.A., Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Kamal, A.H.M., Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Dewan, S., Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
Characterization of water quality in shrimp ponds of different sizes and with different management regimes using multivariate statistical analysis
Coastal shrimp aquaculture in Bangladesh is mostly practiced in an agricultural unit called a Gher, which is a special type of agricultural field with elevated surrounding embankments/borders situated by the side of a river that is used to grow rice in winter and shrimp in summer. Ghers of different sizes are managed in different ways. An on-farm project was carried out to study the effects of Gher size and their related management practices on water quality, shrimp production and the economic returns of shrimp farming in the Southwest coastal region of Bangladesh. We present here the results of this project with respect to water quality as explored through factor analysis, which was applied as a way to understand the nature and extent of the effects of different variables. For the majority of the variables and factors, one-half to two-thirds of their variability was explained by changes over time (months), and a further one-quarter to one-third was explained by Gher size and associated management practices. The alternating dry/monsoon season and water management practices determined long-term and large-scale (annual) water exchange in the Ghers that mainly affected processes related to live and dead particles suspended in the water column. Processes related to decomposition and nitrification were more dependent on short-term (days) water circulation in the Ghers, which is turn was reliant on the time span between the exchanges of water in the Ghers and river. Our results show that improved management leads to higher natural and shrimp productivity in the smaller Ghers and strongly support the argument put forward by the policy makers and scientific community in Bangladesh that the smaller the Gher, the better they can be managed and the better the possibility of increased shrimp survival and production. © Springer Science+Business Media, Inc. 2005.
Scientific Publication
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