These crustaceans provide a valuable food source for some fish.

这些甲壳纲物是某些鱼的食物来源。

Solitary in nature, the trunkfish blows water out of its mouth to expose prey such as mollusks, crustaceans, worms, and sponges.

孤立的性质，硬鳞鱼殴打海水来自嘴里去揭露猎物，如软体物，甲壳，蠕虫和海绵物。

" Water flees fleas" are not insects but copepods, a crustation crustacean like lubster lobsters and crubs crabs but extremely small.

水蚤不是昆虫而是桡脚的物，像龙虾或螃蟹那样有甲壳的，但是非常小的。