Eugene Ng jabbed a pudgy finger against the side of the glass tank, like a predator singling out his unlucky target.

“That fish’s eye is looking a little droopy,” said Mr. Ng, pointing to a fish with large metallic gold scales swimming happily among its companions.

Minutes later, the fish was knocked out and getting an eyelift, a procedure that has become standard practice in Mr. Ng’s job as one of the premier cosmetic surgeons for Asian arowana fish here in Singapore.

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