Top 10 fish facts

It is pregnant. Seahorse males deliver the babies. After mating, the fertilized eggs are embedded in the pouch wall and become surrounded by a spongy tissue. The male provides oxygen and supplies the eggs with prolactin, the same hormone responsible for milk production in pregnant mammals.

Hunting. Swordfish charge at high speeds through forage fish schools, slashing with their swords to kill or stun prey (contrary to the popular belief, they do not "spear"). They then turn and return to consume their catch.

American lobster. In the 1990s several cod stocks collapsed due to overfishing. With the large predatory fish removed, their prey have undergone population explosions, and the capture of lobster has tripled since 1970.

Electric eel lives in muddy floodplains of Orinoco basin. It is well adapted to this low-oxygen environment: it can breathe atmospheric air using a vascularized respiratory organ in its oral cavity. In fact, electric eels must rise to the surface every 10 minutes and inhale, otherwise they die not having enough oxygen from the gill.

Sharks are very primitive and they lack a urinary system. Instead, sharks carry urea in their blood and excrete it through their flesh by osmosis. After a shark dies, its urea turns to ammonia, which can permeate the flesh.

Up to 70 mph. Clocked at speeds in excess of 68 mph, some experts consider the sailfish the fastest fish in the world. Easily recognized, sailfish are named for the spectacular sail-like dorsal fin that extends for nearly the entire length of their silver-blue body. Additionally, the sailfish's upper jaw is far longer than its lower jaw, forming a distinctive bill that looks like—and sometimes acts like—a spear.

Arapaima (Arapaima gigas). The arapaima, pirarucu, or paiche are any large species of bonytongue in the genus Arapaima native to the Amazon and Essequibo basins of South America. Genus Arapaima is the type genus of the family Arapaimidae. They are among the world's largest freshwater fish, reaching as much as 3 m (9.8 ft).

In South America. Electric eels inhabit muddy waters of the Amazon and Orinoco basins floodplains and swamps. Fortunately, these are remote and uninhabited areas, as electric eels can easily kill a human. Although it doesn't eat such large animals (it has no teeth and can swallow only small mammals), a series of electric shocks is enough to stun and drown a horse.

China, with one-fifth of the world's population, accounts for one-third of the world's reported fish production and two-thirds of the worlds reported aquaculture production. The Chinese fishing fleet has access to numerous distant fishing grounds through agreements with foreign countries. That includes West African coast and North and South Pacific.

Whale Shark . The largest fish in the world, the whale shark, is an endangered species found in most of the world’s tropical waters. Like the megamouth sharks and the basking shark, whale sharks are filter feeders and their diet consists almost exclusively of plankton. Because of this they’re completely harmless to humans, and diving with whale sharks has become a popular ecotourism attraction in several countries. The largest individuals can weigh over 30 tonnes and give birth to 300 pups.