What is the biggest fish in the world?

The biggest fish in the world is the whale. A whale can grow up to more than 20 meters long and weigh more than 30 tons. Cetaceans are vertebrates that live in the oceans, and there are several different species, such as blue whales and porpoises. Whales are the largest living creatures on Earth and are threatened by many factors such as climate change and pollution.

Source: WWF