碩士 / 國立臺灣大學 / 漁業科學研究所 / 101 / The two of grouper species, Epinephelus coioides and Epinephelus lanceolatus are often to see in aquaculture in Taiwan. They have a lot of advantages about their high price, high feed conversion rate, high growth rate, and good to eat, but there are less studying about nitrogenous excretion rate in different weight of Epinephelus coioides and Epinephelus lanceolatus. We investigate the nitrogenous excretion rate of different weight of Epinephelus coioides and Epinephelus lanceolatus. These data help the aquaculture engineer to design and optimize the recirculating aquaculture system and provide the polyculture to make the best production and effective aquaculture management. In Epinephelus coioides, the per day per kg weight of ammonia excretion rate are 60.1 and 43.5 mg mg TAN kg-1d-1, and per g feed per TAN mg are 3.59 and 1.45 mg TAN/g feed, and nitrogenous excretion account for nitrogen intake about 14.5 and 15.1%, at 50 g and 600 g, respectively. In Epinephelus lanceolatus, the per day per kg weight of ammonia excretion rate are 43.9, 62.8 and 62.8 mg TAN kg-1d-1,and per g feed per TAN mg are 11.86, 12.20, 7.11 mg TAN/g feed, and nitrogenous excretion account for nitrogen intake about 11.3, 15.1 and 14.3%, at 164 g , 243 g and 359 g, respectively. Ammonia accounted for nitrogenous excretion about 75-85%. There have significant difference (p<0.05) between the light phase and the dark phase of hourly ammonia excretion rate in Epinephelus coioides and Epinephelus lanceolatus.These data show that ammonia will accumulate during 12 hours after feeding and the maximum total ammonia excretion rate will occur in 6-10 hours. We establish the nitrogenous excretion rate in different weight of Epinephelus coioides and Epinephelus lanceolatus. We suggest that should arise the efficiency of ammonia removal rate in recirculating aquaculture systems at 4-10 hours after feeding to prevent the higher ammonia accumulate in the water.
| Identifer | oai:union.ndltd.org:TW/101NTU05451010 |
| Date | January 2013 |
| Creators | Tzu-Chien Tsai, 蔡子健 |
| Contributors | Wen-Shang Hou, 侯文祥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
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