Seahorses don’t have stomachs, just intestines for the absorption of nutrients from food. As such, food passes through their digestive system rapidly and they must eat almost constantly. – WTF Fun Facts
seahorse
seahorses beat their dorsal fin 30 70 times per
Seahorses beat their dorsal fin (30 – 70 times per second) nearly as fast as hummingbirds beat their wings.
– WTF Fun Fact
Source: https://www.visitsealife.com/paris/en/discover/sea-life-creatures/seahorses-and-pipefish/