It's not a good idea to make any big changes to your diet on your own, particularly if you're pregnant or planning a pregnancy, or are breastfeeding. Alligator Gar Leucistic Alligator Gar in captivity at Warm Springs Fish Technology Center, Georgia, USA

Sarcastic Fringehead Sarcastic fringehead living in a plastic tube. Photo: Magnus Kjaergaard, CC BY-SA 2.5, via Wikimedia CommonsThe Blobfish, or smooth-head blobfish, is a deep-sea fish found off the coasts of Australia, Tasmania, and New Zealand. It has a distinctive gelatinous appearance, which has led to its somewhat unflattering name. Found in the western Pacific Ocean and Indian Ocean, the Wobbegong is a species of the “carpet shark” family, and it’s easy to see why. Resembling a large rug compared to the sharks we often think of, the wobbegong spreads itself out on the ocean floor, camouflaged by its flat, tasselled body.

Blue-ringed octopuses are highly venomous, using a powerful neurotoxin called tetrodotoxin to paralyze their prey and deter predators. Although their bite is rarely fatal to humans, it can cause severe symptoms, including respiratory failure. Discover More with Active Wild This weird fish is relatively small, reaching a maximum length of only about 9 centimeters. Despite its eye-catching appearance, little is known about the ecology or behavior of this species. Discover More With Active Wild The humphead wrasse is a striking-looking animal, but that’s not why it’s been included in this list of weird fish. The real reason is that it – and many other wrasse (including the equally strange-looking Asian sheepshead wrasse, Semicossyphus reticulatus) – change sex from female to male as they get older. This only occurs in the largest individuals. Discover More With Active Wild Despite its intimidating appearance, the Atlantic Wolffish, which grows up to 1.5 m in length, is not typically dangerous to humans. It feeds primarily on crustaceans, mollusks, and other fish.The species is a member of the family Lampridae, which also includes the Oarfish and the Ribbonfish. It has a distinctive circular body shape and is one of the very few “warm-blooded” fish that are capable of maintaining a body temperature higher than the surrounding water. Like all piranhas, the red-bellied piranha is a squat, powerful fish, armed with a mouthful of sharp teeth. The species is an omnivore, eating plants as well as a variety of small to medium-sized animals, including fish, worms, and even mammals and birds.

This elusive deep ocean fish lives at depths of over 13,000 feet / 3,962.4 meters and has a long, eel-like body with a gelatinous texture. Very little is known about the faceless cusk’s biology, including its reproductive habits and diet. Discover More with Active Wild The eyes, and the fishes’ flattened, bony head and upturned mouth are adaptations for ambush hunting. A stargazer’s modus operandi is to bury itself in the sand and launch itself at its unsuspecting prey. One of the world’s weirdest-looking fish, the Red-Lipped Batfish is named for its distinctive bright red lips, which contrast with its mottled brown body. It has a flattened body, a wide head, and a pair of modified pectoral fins that it uses to “walk” along the seafloor.Sunfish ( Mola Mola) is a strange and unusual-looking fish. It is disc-shaped and can crow to lengths of 4.5 metres (15ft) and weigh thousands of pounds, making sunfish the heaviest bony fish in the world. Sunfish were previously very rare in UK waters, being found in tropical and sub-tropical species, but possibly as a result of warming seas, they appear to be becoming more common around the British Isles. Flying fish are a group of about 50 species of fish that are found in tropical and subtropical waters around the world. They are named for their ability to leap out of the water and “fly” through the air, which they do to escape predators.