While universities pump out a ton of research on fish farming, much of it doesn't get commercialized, and the duo didn't want to be locked into one bet.

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We should work on ways to improve fish farming techniques and make them more sustainable.

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"Fish-farming on a local basis exists throughout Southeast Asia, but to become a global presence a firm must overcome this obstacle, " says Gerald Bassleer, managing director of the industry's trade group, the Ornamental Fish International in the Netherlands.

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Oh, yes, and Yap has just published a business book on the management lessons he's learned from fish-farming, each chapter starring a different variety of fish he raises.

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