Question: why ludong fish is expensive?
Answer: Ludong is herbivorous, eating only the filamentous algae that live on rocks and boulders in and near river rapids. A mature fish weighs from 0.25 kg to 2 kg and costs P4,000- P5,000 a kilo, making it the most expensive fish in the country. ... This fish is known for its unique taste and peculiar aroma when cooked.