Three thousand aquariums with over one million ornamental fish from all around the world! That's the Glaser family business in Rodgau, near Frankfurt, Germany. Thirty people work there, from animal keepers to specialist vets for the fish. This company is the centre of the world in the business of trading these colorful and exotic creatures.

Koi carp are amongst the kings of the ornamental fish world. These colorful carp from Japan sometimes cost as much as a new car. Demand is great - countless ponds and aquariums need to be filled worldwide, through stores, wholesalers, and specialist dealers.

Join Deutsche Welle's In Focus team as they examine the big fish behind the aquarium business.

In Focus documentaries and reports cover business and science, culture and education, historical and present day events as well as sports and leisure. This wide variety of topics is investigated in depth and presented in an informative format, making for captivating television, courtesy of Germany's Deutsche Welle news network.