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Not everyone can swim with fish in the ocean. But they can enjoy underwater life in another way-by visiting an aquarium.
There is a very large public aquarium in Atlanta, Georgia. The Georgia Aquarium says it is  in the world. It has more than one hundred thousand sea animals in thirty million liters of  . These include two whale sharks ---the    largest fish. And everyone seems to enjoy  huge public aquariums. They have opened around the world. Visiting an aquarium is a good way for children    about sea animals. They might even want to start an aquarium at home and join   of people keeping fish as pets around the world.
We do not really know when people began keeping fish as pets. But people have been interested in fish     a long time ago. Some say the Chinese kept and studied carp(鲤鱼) and goldfish more than one thousand years ago. The   Romans kept eels（鳝鱼) as pets . And the Greek philosopher Aristotle(亚里士多德) might be the to study sea life, including sharks and dolphins.
Some people say that keeping fish at home in small water tanks called aquarium is very  today.