A fin is a unique anatomical feature consisting of bony spines or rays that protrude from a fish's body. They are covered in skin, either webbed against each other like most bony fishes, or fin-like like sharks. Except for the caudal fin or caudal fin, the fins of fish are not directly connected to the spine and are supported only by muscles. Their main function is to help fish swim. Fins on different parts of the fish serve different purposes such as advancing, turning, sustaining and stopping. Most fish use their fins to swim, flying fish use their pectoral fins to glide, and frogfish use their pectoral fins to crawl. Fins can also be used for other purposes. Male sharks and filefish use modified fins to release sperm, thresher sharks use caudal fins to stun prey, reef otters have venom-injecting spines in their dorsal fins, and anglerfish Uses the first spine of the dorsal fin like a fishing rod to attract flies. , Triggerfish avoid predators by shoving into coral crevices and grabbing with the spikes of their fins. A far cry from the highly stylized square fish we learn when we were young, the fish actually have an abundance of bizarre shapes. Fins are one of the main drivers of underwater locomotion in open oceans, sandy bottoms, and reef crevices. But let's take a step back first. Fish not only have a pair of fins, they have seven. There are dorsal fins (below the back), two pectoral fins (one on each side), two pelvic fins (both in the middle of the bottom), anal fins (behind the bottom) and, of course, the caudal fin. Each fin contributes to the fish's ability to survive and navigate its environment. Given the myriad marine environments and challenges, fin morphology has evolved into a corresponding fad. It's hard to move around in water. We humans enjoy the ocean and do our best with specially designed swimming enhancements, but if you ask any snorkeler or diver you will find that fish glide easily through the water and almost appear to fly. would definitely agree with In fact, swimming can be compared to flying, and research has shown that there is a strong similarity between the optimal aspect ratio and the angle of incidence for efficient advancement. Fish fins not only propel the fish forward, but also prevent them from sinking or swimming in the process. Some fish are even hiding in crevices. The triggerfish is named for the "trigger" or spine just before the dorsal fin that flaps when a fish finds a hiding place. This thorn lifts up and the fish's head digs into the cracks in the rock, making it impossible to remove the fish. Such fin adaptations act as a defense mechanism against dire situations. Other notable alterations to the fins include the famous flying fish, which prolongs its glide out of the water to "fly" with its large pectoral fins when danger is imminent, and the ugly fish, which waddles across the ocean floor with modified pectoral fins. Includes a cute frog. Support the fish from the bottom.