There are over 400 species of sharks currently prowling the world's oceans. The smallest shark is the dwarf lantern shark, which has a maximum length of 6.8 inches at maturity. The largest shark is the whale shark, which can reach a length of approximately 40 feet at maturity.
Some common shark species include the great white shark and the tiger shark. Other species of shark are whale sharks and hammerhead sharks.
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The largest shark species in the ocean is the whale shark, which measures between 46 to 60 feet when fully grown. This shark has an average lifespan of 70 years and is known as one of the slowest-moving shark species in the world.
Sharks are fish, but they belong to the group called Chondrichthyes, or cartilaginous fish, which is a different scientific group than most types of fish. Common fish, such as tuna or salmon, all belong to the group Osteichthyes. The distinction is based upon the makeup of their skeletons.
A shark is not considered a mammal. Sharks are considered members of the paraphyletic group of organisms that contain gills, or in other words, fish.
Sharks have the ability to see, but they cannot see colors. Dolphins, whales and other aquatic animals are also color-blind. Marine animals' survival is not dependant on the ability to see color, but rather the ability to see contrast in colors.
The World Wildlife Fund, the U.S. Fish and Wildlife Service and Earth's Endangered Creatures all offer continually updated lists of endangered and other threatened species. Lists of local endangered are also available from state departments of fish and wildlife.
There are about 32,000 species of fish. Each species belongs to a genus. Among them are lampetra, which contains some lampreys. These are primitive fish that have a skeleton made of cartilage, seven pairs of gills, one nostril between the eyes and a round mouth full of horny teeth.
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