通过啃食藻类，食草鱼类会帮助珊瑚礁清理海草，让粉红珊瑚藻得以扎根，形成新珊瑚生长的基质。
By grazing on algae, these and other herbivores keep reefs free of seaweed, enabling pink coralline algae to take hold and form a substrate for new coral.
不仅如此，以食藻鱼类为食的大鱼也可能会有危险。
Not only that, bigger fish that eat the algae-eaters may also be dangerous.
居民们说曾引进的可以大大减少水藻生长的食藻银鲤今年也死了。
Residents say algae-eating silver carp introduced with great fanfare this year have died.
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