Сочинение про рыба на языке 3 - 4 предложение умоляю

В мире очень много рыб. Они бывают разные. И большие и маленькие. Караси, пескари, окуни. 
There are a lot of fish in the world.They are different. And big and small. Carp,minnors,perch.

Fish is a good animal. She swims vizde both in the oceans and in the seas. Fishermen catch it, because it serves food and people and animals. For a polar bear, this is the main food, but let's all still take care of nature including fish !