| Author | Kriengkrai Satapornvanit |
| Call Number | AIT Thesis no. AE-93-30 |
| Subject(s) | Shrimp culture--Environmental aspects
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | This study concerns the environmental impacts of the effluent from intensive shrimp farming. The study shows that shrimp ponds effluent has two aspects that are important: (i) discharged water and (ii) accumulated sediment, Farm practices are the main factor that affects the quality and quantity of effluents. One cycle (crop) of the nineteen intensive shrimp ponds was followed in Khung krabaen Bay, Chanthaburi province, Thailand during the period from January 1993 to May 1993. The study determined the nutrient budget for the farms, specifically nitrogen(N) and phosphorus(P). Only 21.08+2.63 % of the nitrogen and 5.81+0.76 of the phosphorus added to the ponds was in corporated into harvestable shrimp flesh (Penaeus monodon). The remainder is dispersed in the pond as uneaten food, shrimp faeces or excreted matter, and it is then available to support high level of phytoplankton growth and heterotrophic activity. The artificial feed used in the intensively managed shrimp ponds was the major source of nitrogen and phosphorus input to the ponds-94.29 % of total nitrogen input and 91.06 % of total phosphorus input. In the study area, due to a few aerators and no central pond drain, the accumulated sediment was a major sink of nutrients and organic matter in the ponds, Nutrient budgets showed that accumulated pond sediment had 36.21+5.67 % of total phosphorus input and 38.19+6.09 % of total nitrogen input. It is concluded that the management of this accumulated sediment has a major effect on the environmental impact of the intensive shrimp farming. The study showed that effluent quality was extremely poor - high in ammonia and un-ionized ammonia - during harvesting of shrimp because of disturbance of this sediment. After harvesting, the management of sediment is also important. The effects of the nutrients on Khung laabaen bay are determined and modeled. The simple analysis showed that impacts on water quality in the bay are most serious during harvesting of shrimp ponds. The combination of high flushing and low nutrient loadings during normal farming operations appears unlikely to cause significant eutrophication of the Khung Krabaen Bay. |
| Year | 1993 |
| 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 John
|
| Examination Committee(s) | Lin, Chang Kwei ;Yakupitiyage, Amararatne
|
| Scholarship Donor(s) | Government of Netherlands |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1993 |