Nearly 14 years ago, fish hobbyist Nikhil Sood, 43, the owner of a Bengaluru-based aquarium shop, stood next to his friend Benjamin Harink, 45, at a Valapattanam river stream in south Karnataka.

Put more catfish in the net by dialing in their eating habits. If you're wondering what catfish eat, the answer is just about anything. These fish are opportunists that feast on a wide array of food ...