碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 100 / Two experiments were conducted to find a suitable hatching environment and diet to maximize the productivity of intensive culture of fairy shrimp Branchinella thailandensis for the use as live food in aquaculture. The first one examined the effects of 5 types of water (bottled drinking water, double distilled water, mixed tap water and double distilled water (1/3:2/3), mixed tap water and double distilled water (2/3:1/3) and tap water) each set at 3 temperatures (22 ̊ C, 25 ̊ C and 28 ̊ C) on hatchability of B. thailandensis eggs. The second experiment evaluated the effects of 4 types of food (fresh algae Scenedesmus sp. (FA), dry baker’s yeast Saccharomyces cerevisae (BY), algal Chlorella sp. powder (AP) and photosynthetic bacteria Rhodobacter sphaeroides (PSB)) at 2 concentrations (0.01 mg/mL and 0.02 mg/mL) as diets on growth, survival, egg production, life-span and hatching of the same fairy shrimp species.
In experiment 1, Eggs were incubated in each of the designated hatching environment and hatching results were recorded daily for 7 days. For all environments, hatching started within 24 h and maximized in the first day. Most favorable hatching environment occurred in the water made up of 1/3 tap water and 2/3 double distilled water and at 25 ̊ C and 28 ̊ C. Water conductivity was higher at 28 ̊ C than at 25 ̊ C and 22 ̊ C and negatively correlated with hatching rate and pH. The latter two were positively correlated.
The best incubation environment from Experiment 1, namely, mixture of 1/3 tap water (pH, 6.8 ± 0.1; conductivity, 1417.1 ± 12.7 µm/cm) and 2/3 double distilled water and 25 ̊ C were employed for Experiment 2. One day old nauplii (0.91 ±0.10 mm) stocked at 15-20 ind /L were fed with each of the experimental diets. Results of 10 days’ rearing showed that food type effects on shrimp’s growth and survival in descending order were (FA=PSB)>BY>AP. Food concentration at 0.02 mg/mL resulted in better growth but not survival than at 0.01 mg/mL. Food type further affected egg production and adult life-span which were however not influenced by food concentration.
Shrimp fed FA and PSB had the highest egg production, but the egg productions of these 2 groups were of no difference. Shrimp fed BY and PSB had the shortest life-span followed by those fed AP then FA. Egg production was positively correlated with body size. Female shrimp and male life-spans were positively correlated but both life-spans were negatively correlated with total ammonia-N (TAN) concentration in culture water. Hatchability was the only parameter that was not affected by both food type and concentration. In conclusion, best feeding strategy in this study was using PSB at 0.01 mg/mL daily.
| Identifer | oai:union.ndltd.org:TW/100NTOU5086092 |
| Date | January 2012 |
| Creators | Sintouma Dah, 辛度瑪 |
| Contributors | Yew-Hu Chien, 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 | 90 |
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