淡水外來種魚類入侵，一直都是臺灣水域生態面臨的主要問題之一。外來種的入侵除了會壓縮原生物種的生存空間，還會對原生種造成一定程度的威脅。近幾年外來種小盾鱧（Channa micropeltes）的入侵持續受到關注，但針對小盾鱧的相關文獻不多，本研究希望透過所移除之小盾鱧的樣本研究，找出小盾鱧在臺灣湖泊與溪流的成長差異，並找出適合小盾鱧的移除方式。
本研究於2019年8月至2020年9月間，在南投縣日月潭與苗栗縣景山溪兩地，進行小盾鱧的移除與樣本的採集。透過魚體體長、體重、鱗片輪數與輪距的比較，發現日月潭的小盾鱧在相同體長與鱗片輪數區間時，長得比景山溪小盾鱧重。日月潭小盾鱧在鱗片輪數120輪以下的輪距寬度，也比景山溪小盾鱧寬。日月潭小盾鱧的空胃比例更是遠低於景山溪小盾鱧。進一步利用景山溪小盾鱧鱗片輪距與景山溪上游鯉魚潭水庫的降雨資料比較，可以看出景山溪小盾鱧的末段輪數輪距，隨著集水區降雨量減少與水庫蓄水量的降低而變寬。顯示小盾鱧在溪流中的成長會受到水量的變化影響因而較湖泊不利。
從胃內含物的物種分析中，也顯示了小盾鱧對臺灣原生物種的危害非常大。因溪流型小盾鱧有較高機率處於空胃的情況，因此利用誘捕法或許更有利於溪流小盾鱧的移除。湖泊型小盾鱧因其幼魚成群覓食的習性，因此可以透過幼魚集體浮出水面換氣時，利用電器捕魚法一網打盡。小盾鱧的入侵對臺灣水域生態影響頗大，因此呼籲有關單位應嚴正看待，並持續地針對已入侵區域進行移除作業。

Invasive fishes has become a main problem on the freshwater ecosystem of Taiwan. Native species could lost their living habitat due to the threats by invasive species hence decreasing on the number. The awareness of threaten on freshwater ecosystem by giant snakehead (Channa micropeltes) had been raised up these few years but there is lack of the reference on this species. Through the removal on giant snakehead, our experiment tried to find the difference on growth between lake-living and stream-living giant snakehead, and find out the better way to remove this species.
Our experiment had done the removal of giant snakehead in between August 2019 and September 2020. Through the comparison between the body length, body weight, number and width of scale rings on giant snakehead we found out fish that live in the Sun Moon Lake have better growth circumstance than fish that live in Jing Shan River. We had found that when scale ring on the fish grow less than 120, the width of scale rings found on fish in Sun Moon Lake appear to be wider than fish found in Jing Shan River. The empty stomach content ratio of Sun Moon Lake’s giant snakehead is also less than that of Jing Shan River. Futher comparison between the width of scale ring of Jing Shan River giant snakehead and the precipitation of the Li Yu Reservoir showed that the width of the last few scale rings became wider when the precipitation and the accumulation of the reservior became lower. Hence we concluded that the growth of giant snakehead will be varied by the flow of the river and face much more hardtime compare to the giant snakehead that lived in the lake.
The analysis on stomach content showed that the threat on native species by giant snakehead is large. We concluded that fishing with bait/fake bait is an efficient way to eliminate giant snakehead that live in stream due to high ratio of empty stomach content ratio. Elimination of fish that live in lake by electrical fishing during the time they breathe on the surface of water due to group foraging habit of small fish is a working way too. The elimination of giant snakehead is a must due to the mass threaten on the native species.

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