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頁籤選單縮合
題名 | 臺灣養殖牡蠣著苗技術之改進=Improvement of Larval Settling Techniques in Crassostrea Gigas |
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作者姓名(中文) | 鄭金華; 陳紫媖; | 書刊名 | 水產研究 |
卷期 | 16:2 2008.12[民97.12] |
頁次 | 頁81-88 |
分類號 | 439.61 |
關鍵詞 | 巨牡蠣; 單體牡蠣; 附苗; 遠方著苗; Crassostrea gigas; Clutchless oyster; Settlement; Remote settlement; |
語文 | 中文(Chinese) |
中文摘要 | 本研究探討不同基質對牡蠣發眼幼苗著苗之影響。以牡蠣殼為附著基質,發現牡蠣苗在不同的苗殼比例 (40 ~ 100:1) 下的附苗率均在30% 左右,各組間並無明顯的差異。每個牡蠣殼所附著的牡蠣苗隨著苗殼比例增加而增加。牡蠣殼附苗數量以中層者較多,上層及下層者較少,顯示附著基質的擺設位置會影響附苗量;此外,中層牡蠣殼之內表面比外表面有較高之附苗量。牡蠣殼碎片基質大小 (250 ~ 530,500 ~ 1000及1000 ~ 1500 µm) 不影響附苗率,苗殼比以1:2之附著率較佳,1:1次之,2:1最差;另外,容器底面積愈大,牡蠣苗附著在牡蠣殼碎片上之比率愈高。浪板基質經乾淨海水輕輕地去除大型雜物者,其附苗率為28%,較對照組之42% 稍低;將上述浪板以鐵刷刷過,或以毛刷洗淨者,其附苗率分別只有4% 及2%。上述結果顯示,浪板上的微生物可明顯提高牡蠣苗在浪板上的附著率。遠方附苗試驗結果發現,牡蠣發眼幼苗以三種不同之低溫保存24小時後之附著率,由高而低分別為溫度處理4 ℃、8 ℃及12 ℃;而以4 ℃保存1、2、3、4天之附著率分別為20、16、8及3%。 |
英文摘要 | The study was aimed to develop improved methods for spat attachment on various substrata. Using oyster shell as substrata, the settling rate was about 30% among groups with larvae to shell ratio between 40 and 100. More larvae settled on the oyster shell as ratio of larvae to shell increased. Larvae settled on the oyster shell in the middle position of the oyster string were more than those in the upper and lower position. More larvae settled on the outer surface of oyster shell in the middle position of the oyster string. Shell granule sizes (250~530,500~1000 and 1000~1500 µm) had no effect on the settling rate. The settling rates were affected by the ratio of larvae to the number of granules. The setting on the larval shell ratio 1:2 was the highest, 2:1 was the lowest and 1:1 was in between. Besides, more larvae settled on the oyster granules as the bottom surface of container increased. High settling rate (42%) occurred if the plastic plates were immersed in pond water to allow microbes grew on the surface. Settling rates decreased dramatically as the microbes on the surface of plastic sheet were removed with water flow (28%), or scratched with plastic or steel brushes (4% and 2%, respectively). The results indicated that the microbes grew on the surface of plastic sheet enhanced the settlement of oyster eyed larvae. From three temperature remote settling experiments, settling rates of eyed-larvae after being stored in 4 ℃ were the highest, the lowest in 12 ℃, and 8 ℃ in between. The settling rates of eye-larvae after being stored at 4 ℃ from 1 to 4 days were 20, 16, 8, and 3%, respectively. |
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