| Author | Amin, Md. Ruhul |
| Call Number | AIT Thesis no. AE-94-30 |
| Subject(s) | Shrimp culture--Bangladesh
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of
Science, School of Environment, Resources & Development |
| Publisher | Asian Institute of Technology |
| Abstract | Semi-intensive shrimp farming in Bangladesh is a recent phenomena. According to
the Department of Fisheries in Cox's Bazar district, up to June 1993, thirteen semi-intensive
shrimp farm were established, with an area of 139 ha. Besides this, shrimp farming in
Bangladesh is still dominated by extensive methods. This extensive method is an age old
practice characterized by a single crop in the year or by salt-shrimp crop rotation. Due to
the introduction of shrimp farming a vast mangrove area has been destroyed. The impact of
shrimp culture on mangrove is a major issue and there is a growing realization that
aquaculture development should not proceed indiscriminately in mangrove area
(Csavas,1988). This study describes and classifies the shrimp aquaculture farming system
and to identifies constraints to further development of shrimp aquaculture in Cox's Bazar
and Chakaria. This study also concerns the environmental and social impacts from shrimp
farming. The study shows that existing shrimp farming in the study area may be classified
as-semi-intensive,improve extensive or traditional extensive system. In semi-intensive
farming, the average production is 5055 kg/ha/year. In the improved extensive and saltshrimp crop farming system, the average pond yields are 246 and 234 kg/ha/year
respectively. A statistical model was developed to investigate factors controlling shrimp
pond yields. It was found that in semi-intensive farming, feed and stocking density of PLs
are the most significant limiting factors. In extensive and salt-shrimp farming, it was found
that in 1993, application of lime and organic fertilizer and additional stocking density of PLs
are significant limiting factors affecting shrimp pond yields. In 1990, pond drying and water
exchange also significantly affected the yields along with the other three parameters.
However, in 1992 only pond drying was significant along with other three variables. Water
quality analysis showed that the effluent quality from ponds was well within thresholds for
open water eutrophication. The water quality in river and ponds also suitable for marine f.
monodon shrimp farming. Economic analysis and water was quality data showed that among
the different farming system, semi-intensive shrimp farming is suitable in Bangladesh. The
study also showed some negative social impact for shrimp farming. Due to the introduction
of shrimp farming in the recent years, fishermen cannot earn as much as before, apparently
reductions in fish catches in this area. Besides this, about 69% of the interviewed farmers
were taking a sublease from an influential person for a short term basis. For this type of
arrangement, shrimp culture has not developed in an optimal way. For sustainable shrimp
development in coastal areas as community, a holistic system approach should be developed
giving greater consideration to the social and environmental impacts. It was found that
shrimp farming is not the only reason for deforestation of the mangrove in the Chakaria
Sunderbans. Natural disasters, grazing by cattle and buffaloes, illegal fish catching by the
fishermen in the mangrove forest are some of the many causes of deforestation. |
| Year | 1994 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Phillips, Michael J.
|
| Examination Committee(s) | Lin, Chang Kwei ;
Demaine, Harvey
|
| Scholarship Donor(s) | Government of Great Britain |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1994 |