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Facts About Fish

fun facts, types of fish, and their food chain

Talysa Glogower

on 15 April 2010

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Transcript of Facts About Fish

Fish Fast Facts Types of Fish Food Chain fish are the oldest vertebrates of the world
the first fish is supposed to have been found about 500 million years ago
fish are ectothermic (cold-blooded)
their bodies are covered with scales
they have two sets of paired fins and many unpaired fins
fish breathe using the gills, which perform an exchange of gases between the fish’s blood and water
most fish feed on small plants, while others such as sharks feed on other fish
there are over 28,000 known species of fish found throughout the world
they come in huge variety of shapes, colors, sizes
fish are found in all types of water bodies all over the globe there are various different types of fish depending upon their habitats and characteristics. The main categories include freshwater fish, tropical fish, marine fish, cold water fish, and aquarium fish. This is a simplified version of the Marine Food Chain. What most people don't realize, is that every organism is crucial to the cycle of life. If one even one organism is endangered or dies out, it will eventually lead to the death of all creatures in the sea.

Phytoplankton is on the first and lowest level of the food chain. Zooplankton follows shortly behind. The zooplankton are then eaten by krill, small fish, and other crustaceans. These organisms are eaten by bigger fish such as sharks or mammals such as seals, penguins, walruses, and whales. The food chain continues when these marine animals are eaten by land- dwelling mammals such as polar bears.
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