Fish

There are many kinds of fish. Some are ugly, some are pretty. Some have bones, some do not. Fish live in rivers, lakes, streams, oceans, ponds, aquariums, and many more places.

Tropical

Tropical fish are generally colorful. They live in tropical waters. They are very popular aquarium fish. Tropical fish commonly live by coral reefs. Fish use a variety of low-pitched sounds to convey messages to each other. They moan, grunt, croak, boom, hiss, whistle, creak, shriek, and wail. They rattle their bones and gnash their teeth. However, fish do not have vocal chords. They use other parts of their bodies to make noises, such as vibrating muscles against their swim bladder.

Freshwater

Freshwater fish live in places like rivers and lakes. They are the most commonly fished for. Most fish species use their eyes to spot food. Some are even able to see microscopic food items like plankton. Fish can't see anything below their own heads or directly behind themselves. However, they have a very wide range of peripheral vision, so their side views are really good.

Saltwater

  • There are thousands of different saltwater fish species. Many are noted for their dazzling bright colors or distinctive patterns and markings. Some commonly known species include clownfish, angelfish, surgeonfish, lionfish and gobi. All species of saltwater fish can live together.
  • The habitat of a saltwater fish is delicate to maintain because of the rigid conditions needed for most fish to survive. According to saltwater-fish.org, saltwater fish need to live in water with a temperature of between 70 and 80 degrees, a pH level of 8.2 to 8.3, a salt content between 1.022 and 1.025 and an alkalinity level of 3.0.
  • Saltwater fish are found all over the world and live in diverse, delicate ecosystems. Not only can saltwater fish be seen swimming among the coral reefs of the world, but they also are popular in many homes and doctors' offices, as more people are enjoying maintaining their own personal saltwater fish aquariums.
  • Read more : http://www.ehow.com/about_5492308_saltwater-fish.html

Sharks

There are more than 465 known species of sharks living in our oceans today. Sharks are an apex predator at or near the top of their marine food chains, and they regulate the populations of species below them. Sharks belong to a family of fish that have skeletons made of cartilage, a tissue more flexible and lighter than bone. Most species of shark eat things like fish, crustaceans, mollusks, plankton, krill, marine mammals and other sharks. Sharks also have a very acute sense of smell that allows them to detect blood in the water from miles away.

Extras

Above is some sweet fish audio. Definitely worth the thirteen minutes.

Cool map of freshwater species.

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