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題名 | 圓形水泥池吳郭魚超高密度養殖研究=An Experiment on Oreochromis Aureus Cultured with Super-Density Technique in Circular Concrete Pond |
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作者 | 楊國仟; 陳冠州; | 書刊名 | 國際技術合作研究彙報 |
卷期 | 4:2 1997.06[民86.06] |
頁次 | 頁45-55 |
分類號 | 439.5 |
關鍵詞 | 超高密度養殖; 全雄性; 雌雄混養; 過度繁殖; 活存率; Super-density; All-male; Gender-mixed; Mortality; |
語文 | 中文(Chinese) |
中文摘要 | 限制吳郭魚單位面積生產量之主要因素在於水中溶氧量及廢棄物,圓形水泥池在 結構上沒有死角,水流在池內可造成循環,提高水中溶氧量,廢物亦可藉由中央排水管迅速 排出,不造成污染,故可利用此優良特性進行吳郭魚超高密度之養殖研究。本研究使用奧利 亞吳郭魚 (Oreochromis aureus),以 150 尾 / m �臚� 300 / m �藹壑G種不同密度,以及 全雄性與雌雄混養不同性別等,調查其成長情形,並與一般土池放養做一比較,以探討吳郭 魚超高密度養殖之可行性。 經 189 天的調查結果顯示,收成時成魚平均體重以全雄性飼養 密度 150 尾 / m �警蛦怜炕A其次為全雄性飼養密度 300 尾 / m �蘆怴A而以雌雄混養飼養 密度 150 尾 / m �蘆怞赤瓥抮C,分別為:378.2g;336.9g;315.1g。單位面積生產量則以 全雄性飼養密度 300 尾 / m �蘆抭怜炕A其次為全雄性飼養密度 150 尾 / m �纂A雌雄混養 放養密度 150 尾 / m �蘆抭怬C,分別為:97.4kg/ m �纂B55.2kg/ m �纂B46.2kg/ m �纂A 雌雄混養在圓形水泥池內沒有繁殖現象發生。池魚不受鳥獸侵襲,可得較高之活存率。池水 不產生藻類,魚體沒有臭土味。易於管理,可以減少工資的支出。水池結構堅固,可降低維 修費。在吳郭魚養殖上,為具有開發潛力之養殖方法。 |
英文摘要 | Tilapia is among a few improtant fishes which can be raised up rapidly by aquaculture in fresh water. In addition, tilapia with fewer bones, can be processed in the form of fillet to provide high protein resource. Therefore, how to increase unit production of tilapia is a very important topic in recent years. Circular concete pond has no corner inside, so that can be circulating throughly, thus increasing the amount of dissolved oxygen, as well as draining the excretion out through PVC pipe installed in the center of the pond. This experiment was conducted in 1996, and it consisted of three different treatments in each of three concrete ponds: Pond 1, and density of 150 fishes / m �� of all male; Pond 2, a density of 300 fishes / m �� of all male and Pond 3, a density of 150 fishes / m �� of sex mixed genders. It was found that after 189 days of raising, Pond 1 showed the highest rate of growth, follwed by Pond 2, and then Pond 3. The average live weight of tilapia in Pond 1, 2, and 3 were 378.2g, 336.9g, and 315.1g, respectively. The average yield per m �� in the three concrete ponds showed significant differences, 52.2kg in Pond 1, 97.4kg in Pond 2, and 46.2kg in Pond 3. The results above were compared with our previous experiment conducted in an earthy pond in 1993 with a density of 10 fishes per m �� and same duration of cultivation, we came to the following observations: 1. the yield per m �� in concrete Pond 3 treated by a density of 150 fishes of mixed genders was 13 times as much as 3.3 kg in earthy pond. 2. Average live weight of tilapia in earthy pond was 349.7 kg, lower than that of in concrete Pond 2. This indicates that super density of tilapia still allows fast growing as the low density condition. 3. No reproduction was found in gender-mixed concrete pond due to constantly circulating water. In this case, hormone treatment for tilapia is not necessary for sex reservation and thus reducing the product cost accordingly. 4. Concrete ponds with circulating water can remain high level of dissolved oxygen, which results in the lower mortality than that of in earthy ponds. 5. No reproduction of algae was found in concrete ponds due to circulating water. This prevents tilapia body from earthy smell and remain good quality of meat. |
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