Related to sharks and rays, ghost sharks have a unique appearance, with large, wing-like pectoral fins, a long, tapering tail, and a single, continuous dorsal fin. Coming in a variety of different colours, including orange, yellow, blue and white, these fantastic-looking creatures make great subjects for sports divers looking to snap a few underwater photographs. 6. Red-lipped batfish The oceans are home to some of the strangest creatures known to man. Below are some of the world's weirdest fish. 10. Fangtooth The armored snail is currently listed as “endangered,” as its limited range and the potential impact of deep-sea mining activities make it vulnerable to extinction. Discover More with Active Wild These weird fish are mouthbrooders – the female jawfish lays the eggs, which the male jawfish then keeps safe from harm in its mouth until they hatch!

Although unevaluated by the IUCN, species such as the mantis shrimp face threats from habitat loss, pollution, and the impacts of climate change on coral reef ecosystems. Discover More with Active WildThe frogfish changes its color from time to time like a chameleon. However, it takes several weeks to switch from one color to the other. The frogfish does not use its tails to swim like other fish. It does not have a swim bladder. Instead, it uses jet propulsion to move about the water. 4. Boxfish The pelican eel, also known as the gulper eel, is a deep-sea fish found in tropical and temperate waters worldwide. The species is characterized by its large, loosely hinged mouth, which it can expand to swallow prey much larger than itself. The reef stonefish is a highly venomous fish found in the shallow waters of the Indo-Pacific region. It is the most venomous fish in the world, with potent neurotoxins secreted from its dorsal spines. The species belongs to the scorpionfish family, Synanceiidae. Flying fish have a streamlined body and large, wing-like fins that allow them to glide through the air for distances of up to 400 meters at a time. Stargazers are found in both saltwater and freshwater habitats, including coral reefs, sandy bottoms, and estuaries. The different species of stargazers vary in size and coloration.

Despite its name, the vampire squid isn’t actually a squid, or an octopus. It’s also not a vampire, for reasons which should be pretty obvious. In fact, they’re pretty placid considering their scary-sounding name. The immortal jellyfish, Turritopsis dohrnii, is a small jellyfish found in the Mediterranean Sea and the waters around Japan. The species is classified as Near Threatened by the IUCN due to its low reproductive rate and susceptibility to overfishing. Discover More With Active WildIn its native habitat, the blobfish looks almost normal; only when brought to the surface – where there is substantially less pressure – does the fish begin to look “blobby”. Discover More With Active Wild A Portuguese man-o-war has a distinctive, gas-filled float that keeps it at the surface, with long tentacles trailing below, which contain powerful stinging cells used to capture and paralyze prey. The man-o-war feeds on small fish and other marine organisms. Discover More with Active Wild The Blue Parrotfish is a key player in the health of coral reef ecosystems, as it helps to prevent the overgrowth of algae that can harm corals. The Frilled Shark can grow up to 2 meters in length and is a slow-moving, sluggish predator that feeds on a variety of fish and squid. It is rarely seen by humans and is not commercially fished, but it is sometimes caught accidentally as bycatch.