The 18,000 fish species that swim the world’s seas and tidal rivers offer us lucky marine aquarists a lifetime of fascination and thrilling adventures. And with an additional 100 species being discovered each year, even lifelong fish fans cannot guess what treasures the future will bring. The experience of fellow hobbyists and constantly-evolving technology now allows us to keep fish that were rarely seen even in public aquariums not long ago – some, in fact, are only to be found in the collections of serious hobbyists!

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