river chub 淡氏鲈鱼
The chub were well adapted to the poor visibilitycreated by the thick, red water which gave the river its name, and depended onit to hide from predators.
弓背鲑非常适应浑浊红色的河水（这也是河名的出处）中的低可见度，并可以借以躲避天敌。
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