SPECIAL PART: FISH
Fish are animals which live in the water. Their processing of breath consists in extracting oxygen from water using their gills. Fish are composed of different parts: two chambered-heart, operculum, swim bladder, scales, fins, lips and eyes. It can be appreciated the main parts of fish above:
Are you curious?
How many fish species there can be in the world?
It is estimated that there are 32.700 species of fish in the whole world more or less. Exits a great variety and diversity within fish species. Therefore, there can be found some fish groups:
| Fishes |
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TWO KINDS OF FISH WHICH CAN BE INTRODUCED IN AN AQUARIUM
FRESH WATER FISH
Freshwater fish are fish that spend some or all their lives in fresh water. The salinity of water what they live is under 0,05 %
For instance the places which they live are:
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| River |
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| Lake |
Freshwater fish survive thanks to physiological adaptations. It is important to mention that 41,24 % of fish are found in fresh water.
There can be seen different kinds of freshwater fish above:
  AFRICAN JEWELFISH
BLACK TETRA
 LIVINGSTON´S CICHILID
SALTWATER FISH
Saltwater fish are fish that spend some or all of their lives in salt water. This water is composed with a salinity of more than 0,05%.
The places which live saltwater fish are the following ones: Oceans
Salt rivers    CLOWNFISH  ANTHIAS FISH  BUTTERFLY FISH  DRAGONETS |
DOTTYBACKS
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