碩士 / 國立臺灣大學 / 漁業科學研究所 / 91 / Cobia (Rachycentron canadum) a tropical marine teleost, has been cage-cultured in Taiwan. The hatches technologies have recently been successful developed shows the expending growth potential and success of artificial propagation and larval production. The cobia grows rapidly grow up to 4─6 kg in one year with feed conversion ratios of 1.3 to 1.6. Cobia taste flesh and eat with sashimi for food, have high economic value. In recent years, cobia becomes a popular aquaculture fish in Taiwan, Japan, Hainan Island, and other southeaster Asia country. The main protein source in cobia feed is supplied by fish meal, is a big part of the cost of cobia feed. In a prerequisite of no affect in cobia growth, this study use lupin (Lupinus angustifolius) as a protein source to replace a part of fish meal to decrease the cost of cobia aquaculture and improve the competitiveness of cobia aquaculture in Taiwan.
Cobia juveniles were obtained from PingTung, domesticated for a week and random sampling. Cobia were weight and stocked into small offshore cage in fish farm. Two growth trials were in the study. In the first trial, lupin was added to replace fish meal ranging between 0% to 25% in six diets to investigate the optimal replacement ratio of lupin in cobia diet. In the second trial, lupin was treated by different method and then replace fish meal in cobia diets to improve replacement ratio of lupin.
In the first trial, the optimal replace ratio is 20% and have the highest weight gain. In fish body analysis, lipid of liver is increase with the raise of lupin replacement ratio. In the second trial, we use three methods to improve lupin. Heat treatment of lupin can increase weight gain in 20% replacement ratio. Fermented lupin can increase free amino acid of fish body. The adding of extra amino acid of methionine and lysine can increase lupin replacement ratio.
| Identifer | oai:union.ndltd.org:TW/091NTU00451010 |
| Date | January 2003 |
| Creators | Yu-Bin Wang, 王育彬 |
| Contributors | Wen-Liang Liao, 廖文亮 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 73 |
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