给鱼儿减肥这些鱼都在吃什么?它们在吃卷心采啊!许多观看的人都感到十分的惊奇,鱼也吃蔬菜!但是,为什么要喂这些鱼蔬菜呢?

• What are these fish nibbling at? It's cabbage! Many visitors are surprised that fish could be vegetarians too. Why is there a need to feed fish vegetables?