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研究報告

更新日期: 2012-01-04
點閱數: 3,316

生態破壞性外來種水產生物之移除及防治技術

年度 2009
計劃名稱 生態破壞性外來種水產生物之移除及防治技術
中文摘要 A. 小盾鱧:本計畫自98年4月1日至98年12月30日止,每月至嘉義縣曾文水庫南側水域撈捕小盾鱧(Channa micropeltes)之幼魚,並於98年9月1日至10月15日期間,以每週一次到採樣地點採集標本,為期6週之強力捕撈,共採獲837尾,其平均體長為99.89±17.08 (mm),平均體重為12.98±5.78 (g),總重量為11,422.07 g。由每週所捕獲小盾鱧幼魚之資料,利用統計分析得知每週平均體長增長16.64 mm,體重增重2.16 g。依其平均體長(L)與體重(W)關係以線性迴歸分析得知其成長趨勢為W=2E-0.5L2.873。分析小盾鱧幼魚之食性,結果發現粗糙沼蝦和未知種類的幼魚為小盾鱧幼魚成長時主要攝食的對象,依此推估小盾鱧幼魚皆屬肉食性且在幼魚階段就已危及該水庫經濟魚種之魚苗,進而可能影響該水域之生態。
B. 螯蝦:台灣現存兩種入侵種淡水螯蝦-克氏原?蛄(Procambarus clarkia,俗稱美國螯蝦)與四脊滑螯蝦(Cherax quadricarinatus,澳洲螯蝦)的分布範圍正在逐漸擴大中,原現存於南部的四脊滑螯蝦,在今年度的調查中已經往北擴散至嘉義。聚乙醛(metaldehyde)為本地合法的除螺劑,本用於消除福壽螺,為達到防治的目的,本研究探討聚乙醛(metaldehyde)對兩種入侵種淡水螯蝦-克氏原?蛄(Procambarus clarkia)與四脊滑螯蝦(Cherax quadricarinatus)的毒性,並藉此評估進行人為藥物防治的可能性。實驗結果顯示,克氏原?蛄對聚乙醛的耐受性較四脊滑螯蝦高,聚乙醛對克氏原?蛄的半致死濃度 (LC50)大於20 mgL-1,對四脊滑螯蝦則約為17.9 mgL-1。
C. 玻璃魚:調查顯示玻璃魚(Procambarus siamensis)入侵已嚴重影響特定水域之生態系,同時評估移除之效果難以達到目標。玻璃魚入侵日月潭已對於該區域性相關民眾活動造成經濟性損失。
英文摘要 A: The giant snakehead(Channa micropeltes)larva in the Tsengwen Reservoir water areas was sampled monthly with a fishing net from April 1, 2009 to December 30, 2009. A total of 837 fish and weight of 11,422.07g were collected sampled weekly during the period from September 1, 2009 to October 15, 2009. The average body length 99.89±17.08(mm)and weight 12.98±5.78(g) of the giant snakehead larva were sampled six weeks. The average body length add to 16.64(mm) and weight add to 12.16 of the giant snakehead larva used the investigations and the data were statistical analyzed. The results of growth current showed W=2E-0.5L2.873 that the relationship between average length (L) and weight (W) were analyzed with the linear regression. The gut contents of the giant snakehead larva were analyzed that the results showed the major food items were fresh water shrimps (Macrobrachium asperulum) and unknown fish fry. According to the feeding habits of the giant snakehead larva were strong carnivores habit and it may have profound effect on the economic fishes in the ecosystem system of Tsengwen Reservoir .
B: The distribution areas of the two invasive crayfish - Procambarus clarkia and Cherax quadricarinatus are still expanding in Taiwan. The distribution of Cherax quadricarinatus was only in the southern Taiwan three years ago,however, it has spread to Chiayi in the investigation of this year. Metaldehyde is a legal molluscicide in Taiwan for control of apple snail. This study investigated the toxicity of metaldehyde to these two invasive crayfishes. The result showed, Procambarus clarkia has higher tolerance than Cherax quadricarinatus, The half-lethal concentration (LC50) of metaldehyde to Procambarus clarkia is over 20 mg L-1, whereas to Cherax quadricarinatus is 17.9 mgL-1.
C:? Procambarus siamensis (the glass fish) was one an Invasive alien species (invasives) of the in middle Taiwan. (e.g. Sun-Moon Lake). Furthermore, It was create fisherman resulted in economically losses. To remove aquatic invasives was not an ease assignment.
計畫編號 98農科-10.3.1-漁-F2(1)
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