碩士 / 國立臺灣大學 / 漁業科學研究所 / 94 / Kuruma prawn Penneus japonicus is the most precious specie in penaeid shrimps, Survival rate of its aquaculture in Taiwan has been due to disease attack only about twenty percent in recent years; However farming Penneus japonicus still can success, provided with novel idea and the progress technology. In Japan the aquaculture of Penneus japonicus regain its production year after year. The present study regularly investigated the ecology of two different kuruma shrimp ponds, including shrimp growth and unit production in I-Lan country. Two ponds with stock density of 100~120 individuals per square meter were used in June and July. Sophisticated cultivating technology including better pond bottom preparation, good water management, feeding with more nutritious food, and providing more facility were applied. Moreover acute toxicity of four kinds of agricultural pesticides, methyl-parathion, methamidophos, paraquat and butachlor to juvenile shrimp was carried out, trying to find out their safe concentrations for the purpose of offering water quality criteria for farming with other published results.
It is found out that water quality of two ponds did not significantly differ in many ecological factors, apart from salinity. Shrimp production is higher in slightly higher salinity pond(29.3‰) then lower salinity one(21.7‰), the former can produce 1.1 tones of shrimp per hectare, with 10-12 grams in harvest size and 90% survival rate, by 8 partial harvests. BOD, Chlorophyll a, phosphate, silicate, phytoplankton and zooplankton increase with cultural times, all can be used to judge the water quality, especially NH3 and dissolved oxygen. It is suggest that water exchange must be intensified and peddle wheel be installed more to maintain good dissolved oxygen. As do the metal contents of shrimp body, it decreased compared with that in many years, showing usage of copper algaecides is reduced.
From the result of acute toxicity, it shows that the biologically safe concentration for methyl-parathion, methamidophos, paraquat and butachlor were 0.0013, 5.0, 64, and 5.1 μg/L respectively. Therefore, water quality criteria for farming the kuruma prawn are discussed and proposed, with other published data for the ease of managing pond water.
| Identifer | oai:union.ndltd.org:TW/094NTU05451013 |
| Date | January 2006 |
| Creators | Wei-Ta Ruan, 阮暐達 |
| Contributors | 陳弘成 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 87 |
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