The relationship between zooplankton and fish growth in cesspool sludge loaded tanks | |
| Author | Chawalit Orachunwong |
| Call Number | AIT Thesis no. AE-83-22 |
| Subject(s) | Zooplankton Fish-culture Cesspools |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The study was an investigation of the relationship between zooplankton as an available food source and fish growth , and to ascertain an appropriate level of cesspool sludge loading. Five levels of cesspool sludge loading were utilized and halt of the experimental tank were stocked with fish at a stocking density of 10 fish/tank (5m). Loading with cesspool sludge at high levels resulted in elevated pH (8.4-10.7) , low dissolved oxygen (0 mg/l) and high total alkalinity (> 400 mg/l as CaCo3). This deterioration of water quality probably was caused by a. dense growth of phytoplankton and accumulation of organic materials. There was a succession of individual groups of zooplankton in each treatment in a similar pattern.. In unstacked tanks, rotifers we re the most abundant and increased with an increase of cesspool sludge loading levels. Crustaceans tended to decrease With an increase of cesspool sludge loading levels. All of the zooplankton major groups decreased when pH was elevated, and coupled with low dissolved oxygen a nd a gradual increase in total alkalinity. In stocked tanks, fish stimulated the development of crustaceans and large rotifers but depressed small rotifers. Fish grown in tanks loaded at 75 kg COD/ha/day exhibited grazing on cladocerans and resulted in a lesser number of cladocerans as compared with unstocked tanks. The maximum growth rate of fish occurred in high-loaded. tan (150, 225, 300 kg COD/ha/ day) and fed mainly on phytoplankton on, but fish growth later became reduced by an occurrence of massive fish kills. All of the fish in tanks loaded at 225, 300 kg· COD/ha/day were dead and no yields were obtained The maximum extrapolated yields, 4483.8 kg/ha/yr, were obtained from tanks loaded at 75 kg COD/ha/day and were equivalent to yields from tropical tilapia ponds. |
| Year | 1983 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Edwards, Peter |
| Examination Committee(s) | Chongrak Polprasert ; Wee, Kok Leong |
| Scholarship Donor(s) | ASEAN |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1983 |