Every adult male at SeaWorld has a collapsed dorsal fin. This is obviously unhealthy. The dorsal fins help stabilize the animal. Orcas are believed to swim up to 100 miles a day, and it's unlikely they'll be able to do that at SeaWorld in a pool that resembles a bathtub. This is a cause of dorsal fin sagging. SeaWorld lies about collapsed dorsal fins and says they are normal. Seaworld has a list of excuses for collapsed dorsal fins, but these excuses would also occur in the ocean and it is very rare in the ocean. Orcas Don't Need Their Dorsal Fins to Live, But This Shows SeaWorld Isn't Good for Them.