• 作者： 朱祥海
• 作者服務機構： 國立臺灣海洋學院水產養殖學系
• 中文摘要： 為尋求減輕養殖牡蠣的蚵民在經濟上的負擔，採取方便並宜於驅除蚵螺的藥物，選用本省天
  然產的藥用灌木－一夾竹桃（Nerium iudicum Mill, 紅花種），以其葉的煮出液添加海藻酸鈉，
  調製成黏稠糊狀劑，處理大小不同的蚵螺和牡蠣作致死效應的比較試驗。
  由試驗結果認為夾竹桃葉煮出液的使用濃度為原液濃度的20％時，牡蠣的受害率僅有4％，
  而蚵螺的死亡率高達80％。由此可以推知夾竹桃葉的煮出液對牡蠣危害極低的安全使用濃度為原
  液濃度的20％。本實驗所使用的原液濃度係使用 1kg 的夾竹桃葉加 2 的普通海水煮沸濃縮成
  1 而製成。該濃度的20％溶液的膠狀劑對蚵螺卵花的孵化極具有效的抑制作用，並且可使已經
  有Protoconch幼蟲活動的卵囊，在處理後30小時內停止其活動而後死亡。又使用同濃度的膠狀
  劑在蚵園現場噴灑，當場蚵螺的脫落效果較目檢者高出26％，脫落蚵螺拿於24小時之間死亡率達
  60％，衰弱者佔40％，但衰弱?中復活可能者佔23％。
  t
• 英文摘要： The crude leaf extract of Nerium indicum,a medicinal and venomous shrub, was effectivein controlling the oyster drill, Purpura clavigeraand its capsules. The stock solution was ob-tained by boiling 1kg of the fresh leaf of Neriumindicum with 2 liters of sea water, then con-densed to 1 liter. It was found in this experimentthat the rate of mortality was 4% for oysterand 80% for oyster drill at 20% dilution ofthe stock solution. In oyster park an operationto eliminate the oyster drill was carried out byusing the knapsack type power duster mistblower, a gain of 26% was obtained in com-parison with the method by eye counting.There was no toxicity effect on mice as theyfed on the pellets contained three different con-tents, 25%, 50%, and 75% of oyster meal,which were treated with 15% and 250% dilutionof the stock solution, for 6 days in succession.
• 中文關鍵字： --
• 英文關鍵字： --