博士 / 國立臺灣大學 / 動物學研究所 / 87 / The effective concentrations of 2-PE and MS-222 in Zacco barbata were 300ppm and 80ppm , respectively. These two concentrations of anesthetics not only reduced oxygen demonds but also prevent fish from mortality during the anesthetization process.
Acute toxicity of copper, cadmium, and mercury to the freshwater fish Varicorhinus barbatus and Zacco barbata was studied for the protection of river water quality and the ease of aquaculture pond management. The results are summarized as follows：
1. In all cases, the higher the concentration of metal used, the quicker the animal died.
2. The 24-h LC50 values of copper, cadmium, and mercury to V. barbatus were found to be 0.305 mg/l Cu, 1.657 mg/l Cd, and 0.183 mg/l Hg; the 96-h LC50 values decreased to 0.246 mg/l Cu, 1.502 mg/l Cd, and 0.168 mg/l Hg,respectively.
3. The 24-h LC50 values of copper, cadmium, and mercury to Z. barbata differed at 0.130 mg/l Cu, 2.598 mg/l Cd, and 0.201 mg/l Hg; the 96-h LC50 values were found to be 0.079 mg/l Cu, 1.510 mg/l Cd and 0.161 mg/l Hg,respectively.
1.The 24-h,48-h,72-h,96-h LC50 (median lethal concentration) of ammonia for juvenile Zacco barbata were 5.82, 5.33, 5.04, 5.00mg/l NH3- N , respectively.
2.The 24-h,48-h,72-h,96-h LC50 (median lethal concentration) of nitrite for juvenile Zacco barbata were 141.10, 84.38, 73.83, 40.16 mg/l NO2-N, respectively.
3.Biological safe concentration for juvenile Zacco barbata was 0.50 mg/l NH3-N and 4.02 mg/l NO2-N, respectively.
4.It is clear that ammonia shows more toxic to juvenile fish than nitrite.
| Identifer | oai:union.ndltd.org:TW/087NTU00312007 |
| Date | January 1999 |
| Creators | Shyong Wen-Jiunn, 熊文俊 |
| Contributors | Chen Hon-Cheng, 陳弘成 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 104 |
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