Water quality assessment in intensive shrimp ponds : a case study in Ranong, Thailand | |
| Author | Warisara Lertpaitoonpan |
| Call Number | AIT Thesis no.EV-00-18 |
| Subject(s) | Water quality bioassay--Thailand--Ranong Shrimp culture--Thailand--Ranong |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | Shrimp pond operation for one complete cycle was monitored at shrimp pond located at Ranong, Thailand. Operation of two ponds was monitored. Pond A had a working volume of 10,240 m3 and area of 0.64 ha, while pond B had a working volume of 5,040 m3 and area of 0.36 ha. Pond operation lasted for 106 days for pond A and 91 days for pond B. The food conversion ratio recorded for pond A was estimated to be 3 .2, resulting in 1 kg of shrimp produced from 3.2 kg of food fed. FCR was very high compared with standard value, 1..5-2.5. Daily water exchange was about 2.6 % of pond volume of pond A. Total water fed into shrimp pond, 7 % and 42 % accounted for evaporation and seepage respectively for pond A. Water quality of pond water in pond A could be described as follows: DO 4-10 mg/L, pH 6-8, ammonia nitrogen 0.005-0.1 mg/L, nitrate nitrogen 0.0-0.3 mg/L, phosphorus 0.0-0.4 mg PO/-P/L, turbidity 6-51 NTU, TSS 22-84 mg/L, chlorophyll a 0-60 μg/L and alkalinity 35- 210 mg CaC03/L. Water quality of pond water in pond B could be described as follows: DO 4-8 mg/L, pH 5-9, ammonia nitrogen 0.01-0.5 mg/L, nitrate nitrogen 0.0-0.2 mg/L, phosphorus 0.0-1.7 mg P04 3--P/L, turbidity 9-69 NTU, TSS 30-159 mg/L, chlorophyll a 0-30 μg/L and alkalinity 10-175 mg CaC03/L. BOD5, COD and nitrate nitrogen concentration ranges were same in both ponds: 0-5 mg/L, 15-30 mg/L and 0.00-0.01 mg/L respectively. Failure of pond B could be attributed to lowering of pH to 5 which is toxic to shrimp. Lower pH in pond B resulted from acidification of pyrite in soil compounded by lack of water exchange from pond. Lower pH also affected phytoplankton population in pond B that reduced buffering as well as oxygenetion capacity. |
| Year | 2000 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Annachhatre, Ajit P. |
| Examination Committee(s) | Lin, C. Kwei;Suwalee Chandrkrachang;Visvanathan C.;Nielsen, Per |
| Scholarship Donor(s) | Sripatum University |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2000 |