碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 92 / The white shrimp, Litopenaeus vannamei, is distributed along the eastern Pacific coast from northern Mexico to northern Peru. This species inhabits the lagoon and river mouth with a wide range of salinities and dissolved oxygen. For further comprehension about shrimp at various salinities, we tried to evaluate the white shrimp’s growth, including its survival rate, growth rate, feed conversion rate and condition factor of juveniles at 4 different salinities (0, 5, 15 and 35ppt). The second and third experiment used 3 salinities (5ppt, 15ppt and 35ppt) to evaluate its physiological responses, including oxygen consumption, ammonia excretion, hemolymph GOT, GPT, cholesterol and triglyceride of adult shrimps. The result shows that growth rate in lower salinity (0ppt, 5ppt) is inferior to 15ppt and 35ppt. We consider that white shrimp’s growth factors would be suppressed while maintained in lower salinity. In physiological responses, the oxygen consumption and ammonia excretion of 5ppt salinity treatment was significantly higher than that observed in shrimps maintained in 15ppt and 35ppt salinity. In 5ppt and 15ppt treatment, the hemolymph triglyceride in shrimps is decreased as time elapsed. We believed that white shrimp would expense more energy, such as lipid, when encountered stress. Therefore, we can recognize that the change of oxygen consumption, ammonia excretion and hemolymph triglyceride are related to white shrimp’s physiological metabolism. The differences in enzymatic activity for GOT and GPT between each treatment is not significant, it is possible to conclude that the salinities do not inhibit the enzymatic activity of GOT and GPT in shrimp hemolymph. Finally, we also can conclude that lower salinity is not the optimum environment for culturing white shrimp, 15ppt~35ppt are considered ideal for optimum salinity for L. vannamei.
| Identifer | oai:union.ndltd.org:TW/092NTOU5451010 |
| Date | January 2004 |
| Creators | Yeong-Chang Luo, 羅永昌 |
| Contributors | , 李明安, 冉繁華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 59 |
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