碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 100 / In this experiment, Danish high-density recycled water system was used to produce 100 kg groupers per ton of water. To prevent large loss caused by system problems, addition of water treatment equipments and alarm systems has been installed in order to achieve the 24-hour monitoring control. In the beginning, 800 fish with total weight of 85 kg were stocked in the two 2 ton FRP (fiber glass) tanks, tank A with total weight of 37.5 kg, average stocking of 80.9 g, and tank B with 47.6 kg, average of 147.4 g. The growth performance, weight gain and stocking density was recorded on a regular basis within 238 of rearing days, with daily feeding about 0.5 ~2% of body weight. At the end of the trial, density in tank B was increased up to104.7 kg per ton of water, while for tank A, the fish density only increase up to 60.8 kg per ton of water due to the poor condition. In the trial, weight gain tends to decrease with the greater fish size in the fixed period. Finally, based on the experience of this period on rearing grouper and water quality, an operation process is procedure in the thesis for growing out grouper in the super-intensive recirculation system.
In order to understand the process of nitrification efficiency in the system, the ammonia, nitrite and nitrate concentrations of water in and out in various facilities were compared to understand the nitrification in the environment with pH 6.5 and pH 7.0. The results showed that the increase of feed ration will decrease pH and increase ammonia concentration. Therefore, water had to be changed regularly and trickle sodium carbonate slowly to raises the pH for reducing ammonia and nitrite concentration, and water changes. In this study, an experiment was designed to compare treatment efficiency at pH 6.5 and pH 7.0. Water samples were taken at immersed biofilter, trickling biofilter and protein skimmer inlet and outlet. The results showed that the processing efficiency of the equipments in the system at pH 7.0 is significantly better than at pH6.5.
| Identifer | oai:union.ndltd.org:TW/100NTOU5086110 |
| Date | January 2012 |
| Creators | Chi-we Lee, 李致緯 |
| Contributors | Chyng-Hwa Liou, 劉擎華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 87 |
Page generated in 0.0014 seconds