Puffers live in warm and temperate parts of the world, mostly in the sea but sometimes in brackish or fresh water as well. They have tough, usually prickly skin and teeth that are fused together to make a beak-like structure. Each jaw is split down the middle. Most puffers are much smaller than the biggest ones, which are about 90 cm (3 feet) long.
Lionfishes (Pterois) are any of several species of colourful Indo-Pacific fish in the family Scorpaenidae (order Scorpaeniformes). They are known for their poisonous fin spines, which can cause painful, but rarely fatal, puncture wounds. The fishes have bigger pectoral fins and longer spines on their dorsal fins, and each species has a different pattern of bold, zebra-like stripes.
The candiru (Vandellia cirrhosa) is a parasitic catfish without scales that lives in the Amazon River. It is a member of the Trichomycteridae family. It is clear and eel-like, and it grows to about 2.5 cm in length (1 inch). The candiru lives in the gills of other fish and feeds on their blood.
The white shark (Carcharodon carcharias), also called the great white shark or the white pointer, is one of the most powerful and potentially dangerous predatory sharks in the world. It is also known as the great white shark or the white pointer.
Moray eels are different from other eels because their gill openings are small and rounded, and they usually don't have pectoral fins. Their skin is thick, smooth, and doesn't have scales. Their mouths are wide and their jaws have strong, sharp teeth, which help them catch and hold their prey (mostly other fish) and cause serious injuries to their enemies, including humans. Moray eels usually have bright markings or colours.
Piranhas, also called caribe or piraya, are any of more than 60 species of razor-toothed, carnivorous fish that live in the rivers and lakes of South America and have a reputation for being very dangerous. In movies like Piranha (1978), the piranha is portrayed as a hungry, ruthless killer. Most species, however, are scavengers or eat
Stonefish are marine fish in the genus Synanceja and the family Synancejidae. They live in shallow water in the tropical Indo-Pacific and are poisonous. They are slow fish that live at the bottom among rocks or coral, in mud flats, and in estuaries. Fish with thick bodies, big heads and mouths, small eyes, and bumpy,
Manta rays, also called devil rays, are a type of marine ray that belongs to the family Mobulidae (class Selachii). Flattened and wider than they are long, manta rays have large, fleshy pectoral fins that look like wings. The front of the head has cephalic fins that look like the horns of a devil. Some species of manta rays have stinging spines on their short, whip-like tails.
The well-known sea jelly is big and clear, with a bell that looks like a box and up to 60 tentacles in four groups along the base of the bell.