It is interesting that the largest animals living in the sea are not fish but mammals, of which the blue whale is the largest mammal today, the average length of an adult blue whale is about 27 meters and weighs nearly 200 tons.
Among the world's largest marine animals, up to 17 species belong to the mammal class, the rest are fish species. Contributing to the top 30 is a mollusk, a giant squid.
There are also very large species such as Kaluga salmon, Amazon river seal fish, freshwater dolphins, etc. but they are not included because they are freshwater animals, this article only lists marine animals.
