Most aquatic animals have adapted to the water so that they may breathe and move swiftly through the water. Some have even adapted by the color of their scales to blend in with their surroundings. Those fish, which live mostly in deeper depths of the water or are nocturnal, may appear red in color. The reason for this is because, in the dark of night, or in the dark of the deeper water red light is filtered out and cannot be seen as well to other fish which may prey upon these fish which are red in color (Fish Biology & Anatomy, 1997). They instead appear to be gray in color.
Fish have gills through which water flows and filters the oxygen out of the water.
The gills work similarly to our lung in that the lungs filter oxygen out of the air we breathe in. The gills have cells, which are in rows and columns. These cells are grouped together and are call epithelium (How Fish Gills Work, 2011). "Both fresh water and salt water fish can deal with the problem of sodium maintenance" (How Fish Gills Work, 2011). If they could not then fish would not be around today, they would have died off. Within the epithelium there are chloride cells which rid the fish of any unwanted sodium. This is how they have adapted to their environment to breathe.
[...] They have gills for which to breathe (which also help with the sodium level within the fish), different types of fins to help them maneuver through the water, senses which help them detect movement to avoid predators and find food, and a swim bladder for stability and buoyancy. Works Cited Dery, B. "The Visual Dictionary." 2011. Infovisual July "External Anatomy." n. d. Badman's Tropical Fish July "Fish Biology & Anatomy." 1997. National Aquarium In Baltimore July "How Fish Gills Work." 2011. Today I found out July 2012 . [...]
[...] There are small hairs along the lateral line which are sensitive to vibrations (Fish Biology & Anatomy, 1997). The purpose for the lateral line system is to help fish swim as a group or school of fish, to avoid would be predators, and to help them find food. The letter L in the picture below indicates the lateral line (External Anatomy, n. d.). (External Anatomy, n. d.) The swim bladder is an organ within the fish which helps to stabilize it. [...]
[...] Internal anatomy of a bony fish Individual Physiology Assignment (Dery, 2011) Most aquatic animals have adapted to the water so that they may breathe and move swiftly through the water. Some have even adapted by the color of their scales to blend in with their surroundings. Those fish, which live mostly in deeper depths of the water or are nocturnal, may appear red in color. The reason for this is because, in the dark of night, or in the dark of the deeper water red light is filtered out and cannot be seen as well to other fish which may prey upon these fish which are red in color (Fish Biology & Anatomy, 1997). [...]
[...] Pectorial fins (side fins) help them to move from side to side. Tail fins are the main fin which propel the fish through the water. The shape of the tail fin tells how fast of speed the fish can swim. (Fish Biology & Anatomy, 1997) This is a crescent-shaped tail fin. Fish with these types of tails are very fast swimmers and move constantly. This is a forked tail fin. Fish with these types of tails swim fast, but not all the time. [...]
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