I think there are many reasons why the yellow croaker was endangered before. The most important one is that the yellow croaker lived in a complex environment, and they had to rely on this special environment to survive. However, due to environmental pollution, such as sewage discharge or some white pollution flowing into rivers, their habitats are destroyed. Therefore, the living environment of yellow croaker has been greatly affected. Part of it is caused by people's killing, because the number of yellow croaker is originally small. But after people's killing, it may be that these fishermen killed those yellow croaker by mistake. Maybe these fishermen just want to earn the corresponding money to support their families, but they don't know that they have destroyed our neighbor, the yellow croaker living on the earth. Another reason is that their habitats are shrinking, and people are paying more and more attention to their own development. Therefore, many cities are taking measures such as reclamation, which will make their habitats smaller and smaller, and finally there is no place to live. So yellow croaker will be endangered.
These are some of the main reasons why croaker was on the verge of extinction before. We should also protect these endangered animals in our lives and add a more beautiful color to the earth.