碩士 / 國立海洋大學 / 水產養殖學系 / 91 / High feeding efficiency is one of the important factors for successful aquaculture. The most directly and best method to promote feeding is to make the cultured animals aware of the food existence and accept the food, i.e., increase food attraction. It is often documented that glycine (G), taurine (T), and betaine (B) are relatively strong attractants for crustacean. Therefore, this study aimed to evaluate the attractability of these three substances to postlarvae and adults of Pacific white shrimp Litopenaeus vanamei and sand shrimp Metapenaeus ensis.
Agar and carboxyl methyl cellulose were used as basal ingredient and mixed with various dose of each attractant to make dry pellet feed. These feed with single attractant but varied concentrations were feed to postlarvae and adult of both species and used access rate and ingest rate, respectively to find out the most effective dosage (MED, the lowest dosage at which the attraction was the highest) of each single attractant. Four multiple attractant feeds were then made by mixing 2 to 3 attractants with their most effective dosage. Single and multiple attractant feeds were finally pooled together and subjected to overall attraction tests.
MEDs were 0.4, 0.2, and 0.8 M for G, T, and B, respectively, in adults of sand shrimp. MEDs were 0.4, 0.2, and 0.2 M for G, T, and B, respectively, in adults of white shrimp. For both adult shrimps, attractability was G>T>B. The attraction of G only being greater than G couplings indicated that G had the greatest attraction and the couplings inhibited G’s attraction. For postlarvae, MEDs were 0.2, 0.2, and 0.4 M for G, T, and B, respectively, in sand shrimp, which were lower than those in white shrimp: 0.8, 0.8, and 0.8 M for G, T, and B, respectively. Overall attraction tests for postlarvae showed that in sand shrimp only TB and GTB had their attraction greater than blank (feed without attractant incorporated) and in white shrimp only G, T, B, and TB had greater attraction than blank. A parallel comparison showed that commercial feed releases much lower concentration of G and T than our experimental diets; however, its attractability was much higher than the average. This can be attributed to that commercial feed had higher variety of attractants than ours, even the released concentrations were lower than our, the positive synergistic effects could actually enhance the attraction.
| Identifer | oai:union.ndltd.org:TW/091NTOU0086020 |
| Date | January 2003 |
| Creators | Nai Tzu Hsueh, 薛乃慈 |
| Contributors | Chein Yew Hu, 陳瑤湖 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 1 |
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