is in bony fish and can move independently. . There are over 350 different species of sharks. Diet Sharks vary greatly in their diets, but they are all carnivores. Most of the world's fish species are categorized into two types: bony fish and cartilaginous fish. Male sharks have mixoptyerigia, or pelvic claspers, an extension of the cartilaginous skeleton that serve as the sperm conducting structure for internal fertilization. . Examples include the blue shark and the mako. Intelligence Scientists have shown that sharks are relatively intelligent and can learn at a rate similar to that of rats and birds. Evolution of Bony Fish, the first fish-like creatures appeared over 500 million years ago. Raja of the family Rajidae.
The teleosts have an ossified internal skeleton, meaning it is made of calcified bone, just like ours. . Biggest, Smallest, Fastest, the biggest, or heaviest, fish is the ocean sunfish which can weigh as much as 5,000 pounds. They live in waters all over the world, in every ocean, and even in some rivers and lakes. Some (like the zebra horn shark, angelshark, and wobbegong) are slow-swimming predators that crush and eat shellfish ( crabs and clams ) from the ocean floor. Fish live in nearly every large body of water in the world including streams, rivers, ponds, lakes, leadership experience in school essay and oceans.