https://phys.org/news/2018-08-war-sharks-rogue-fishing-fleets.html

Only small pieces off those 6,000 carcasses were actually of much value. The fins.

Shark fins are a delicacy in China, the feature ingredient in an expensive soup served at banquets and fancy restaurants. At peak, dried fins have sold for more per pound than heroin. That price, coupled with high demand from a booming Chinese economy, has created a brutally efficient industry capable of strip-mining sharks from the sea.