What fish can swim backward?

There are a few fish that can swim backward, but it's not a common ability among fish in general. Here are a few examples:

* Seahorses: While they have a unique body shape and swim upright, they can maneuver backward by flapping their dorsal fin.

* Angelfish: These beautiful fish can move backwards using their pectoral fins.

* Butterflyfish: They use their pectoral fins for precise movements, including swimming backward.

* Shrimp: While not fish, these crustaceans use their strong abdominal muscles to swim backward.

It's worth noting that most fish are more efficient at swimming forward, and backward swimming is usually a short burst of maneuverability or escape tactic.