草食性鱼种抑制凤眼莲生长的试验

通过严密的设计，在相同规格的16只网箱中，采用草鱼、杂交鱼草鱼（6）和赤眼鳟（早）杂交繁育的F1]、三角鲂、赤眼鳟、异育银鲫和翘嘴红鲐等为试验对象，对凤眼莲生长的影响进行研究。结果表明：不同品种的鱼苗具有不同的控制凤眼莲的能力；在2．5～9．0cm范围内各鱼苗食用凤眼莲能力依次为：草鱼〉杂交鱼〉三角鲂〉赤眼鳟〉异育银鲫〉翘嘴红舶。

Experiments on Herbivorous Fishes Inhibiting the Growth of Water Hyacinth （Eichharnia crassipes ）

Water hyacinth will cause diversity damage and ecological crisis once it is introduced into a new area because of its rapid and fast growth. In China and abroad, chemical technology and manual salvage and mechanical method or introduction into natural enemy of water hyacinth are used to remove or control water hyacinth. Although these methods offer certain effectiveness, it has some disadvantages of high cost, secondary pollution and lacks of not thorough enough. In this paper, we used rigorous design to study the inhibition effect of herbivorous fish such as grass carp, hybrid （F1 from Ctenopharyngodon idellus（ ♂ ） and Squaliobarbus curriculus（ ♀ ）, Magalobrame tarminalis, Squaliobarbus curriculus, Allogyno genticcrucia and Erythroculter ilishaeformis on the removal effect of water hyacinth. All the juveniles were put in the same sixteen cages. The results showed different fingerlings with the same size （2.5-9 cm） had various capabilities to eat water hyacinth and arranged in following order： Ctenopharyngodon idellus 〉 hybrid 〉 Magalobrame tarminalis 〉 Squaliobarbus curriculus 〉 A llogyno genticcrucian 〉 Erythroculter ilishaeformis. The results indicated that herbivorous fish had different removal effects on water hyacinth. The present study innovatively used different kinds of fingerling to control water hyacinth, and provide a new approach to control ecological harmfulness caused by water hyacinth. The test shows that there is a bright application future to control water hyacinth with herbivorous fish.