Methuselah is an old fish. It lives in an aquarium(水族馆) in San Francisco, US. Methuselah is the name of a very old person in the book Bible.
This fish is around 90 years old. Scientists say that it is the oldest aquarium fish in the world. They brought it from Australia to the US in 1938. The fish is 1.2 meters long. It weighs around 18 kilograms. It eats other fish.
This kind of fish has both lungs and gills(鳃). There are few of this fish in the sea. It often lives in the fresh water(淡水). Scientists say that it is the animal between fish and amphibians. An amphibian can live on land and in water, too. For example, a frog.
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