碩士 / 國立中興大學 / 獸醫學系暨研究所 / 100 / Formalin (37% formaldehyde) is approved for use in aquaculture as a chemical for controlling ectoparasites and aquatic fungi in the US, Canada, and Asia while it is prohibited in Australia, Europe, and Japan because of its association with oncogenesis. Safety about formalin-treated aquatic animals used for food has been discussed in the aquaculture industry. The aim of this study is to determine the residual concentrations of formalin in muscle and liver in cultured tilapia (Oreochromis hybrids). Acute toxicities of formalin to tilapia were determined under a semi-static condition at 27℃. Talapia was bath treated with formalin at 25 and 50 ppm, respecilively. Our results showed that the median lethal concentration (LC50) lowered progressively as the duration of exposure increased. The toxicity curves became almost asymptotic with the time axis by 96h. The 48h-LC50 and 96h-LC50 was 179 and 177.2 ppm at 27℃, respeclivdy. After 50 ppm fotmalin treatment has been found to cause gill lamellar epithelia separation, hypertrophy, and necrosis under the histopathology examindion. Meanwhile, the time of undetectable residue amount of formalin in tilapia liver and muscle tissue at 25, 50 ppm was (0, 2) and (2, 2) hour, respectively. Formalin can be used at a concentration of 25 and 50 ppm in talapia without resulting in formaldehyde residues in the edible tissues.
| Identifer | oai:union.ndltd.org:TW/100NCHU5541027 |
| Date | January 2012 |
| Creators | Chen-Hsuan Chang, 張鎮璿 |
| Contributors | Way-Shyan Wang, 王渭賢 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 76 |
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