There are many kinds of fish, which are usually divided into four kinds according to their different feeding habits, namely herbivorous fish, carnivorous fish, filter-feeding fish and omnivorous fish, among which herbivorous fish and omnivorous fish can eat grass, mainly eating aquatic plants, algae and duckweed. Of course, they don't just eat these things, and sometimes they also eat some insects to supplement nutrition.

1. Grass carp: Grass carp is a typical herbivorous fish, which is distributed in many rivers and lakes in China, mainly living in the middle and lower layers of water bodies, and likes waters with more aquatic plants. I am lively, swim very quickly, and have the habit of foraging in groups. This kind of fish mainly eats algae and insect larvae in the juvenile period, while the adult fish feeds on plants, but also eats meat.

2. Carp: Carp is an omnivorous fish, which has a wide range of food acceptance, so it also eats grass. Although this fish looks toothless, it actually has throat teeth, which can grind food and facilitate digestion, which also helps to cut it off when eating grass.

3. Bream: Bream is also a herbivorous fish, which usually feeds on aquatic plants such as subtilis, Hydrilla verticillata and Potamogeton, but it can also eat the leaves of some terrestrial plants, and its feeding range is relatively wide. It usually eats from April to November, with the largest appetite in summer.