碩士 / 國立屏東科技大學 / 水產養殖系 / 91 / To investigate the current aspects of freshwater giant prawn, Macrobrachium rosenbergii, cultured in Taiwan, a three-experiment monoculture system was carried out and all items of cultural parameters were also collected. Three trials with an area of 1) 0.7 ha area with one 0.1 ha pond plus two 0.3 ha ponds, 2) 0.7 ha area with one 0.3 ha pond and one 0.4 ha pond, and 3) 1.0 ha area with one 0.4 ha pond and two 0.3 ha ponds. The raising periods were 357, 224 and 388 days, and the stocking densities were 42.85 prawns/m2, 28.57 prawns/m2 and 50.00 prawns/m2, for each trial respectively. During the raising periods, parameters, including temperature, feeds, water exchange and water quality were measured daying. Prawn growth rates were also estimated by random sampling every two weeks. The results indicated nursing ponds the survival rates were 39.2%, 36.9% and 24.6%, the total survival rates were 13.5%, 15.7% and 13.2%, the production harvested were 1.115 mt/ha, 1.042 mt/ha and 1.817 mt/ha, the feed conversion rates (FCR) were 6.13:1, 3.07:1 and 2.86:1, and the total water exchange were 11,356.85 mt/ha, 11,443.85 mt/ha and 11,474.00 mt/ha for the three experiments, respectively. The highest survival rate among the nursing ponds was observed in the first experiment with postlarvae purchasing from local hatchery farms. The total survival rate was highest in the second experiment due to its lower stocking density and the fungal yeast infection in the first experiment. The per hectare production of the three experiments were far below the intensive culture system standard (2-5tons/hectare).
The possible reasons of the lower production were ascribed to several problems, poor post- larvae quality, size-dependent market demand, prolonged culture periods resulting in defferent prawns population structure.
| Identifer | oai:union.ndltd.org:TW/091NPUST086002 |
| Date | January 2003 |
| Creators | Long Chi Chen, 陳隆吉 |
| Contributors | Wen Chung Chang, Winton Cheng, 張文重, 鄭文騰 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 75 |
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