杂食性的水虎在这些河流的生态环境中扮演的非常关键的角色，它们在扮演昆虫、鱼的猎食者的同时也被河豚、鳄鱼和其他大型鱼类所猎食。
They are omnivorous and play a key part in the ecology of these rivers eating fish plants and insects but also acting as prey for dolphins, caiman and larger fish.
杂食性和草食性鱼类的感染率较高，肉食性鱼类较低。
The infection rates of omnivorous and herbivorous fishes were higher than that of carnivorous fishes.
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