Scales, theclothing of fish...

In humans the outermost covering of body is the skin,which protects our internal organs from damage. Likewise in fishes the body is covered with scales. Scales form an integral part of body covering.

                             The image shows the fish with its scales.

Scales vary greatly in size, shape and structure.

Fish scales are divided into various categories and are shown below with the help of diagrams.

Diagram (a) signifies the Cycloid scales found in Teleost fishes

Diagram (b) signifies Ctenoid scales


Diagram (c) and (d) are for the Placoid scales present in sharks and rays

Diagram (e) signifies Ganoid scales present in Sturgeons and Bowfin

The morphology of scale helps in the identification of a fish. A particular species of fish has a particular kind and number of scales throughout the world.

http://allfishblog.blogspot.com/2011/03/s.html

Fishes the most wonderful creatures of world..

Fishes are one of the most wonderful and colorful creatures in the world..

6 spine butterfly fish

Total of 31, 900 variety of fishes occur in world, which includes both salt and fresh water fishes.
They vary greatly in shapes, sizes, colors, food and living habitats.
Fishes are cold blooded creatures. They are either cartilaginuous or bony.
They bear gills for respiration, instead of lungs and are zoologically termed Pisces.

Circulation occurs in the form of closed loop circulatory system and digestion through esophagus

Excretion from body occurs in the form of nitrogenous wastes(Ammonia)

Body is usually covered throughout with scales, but some do not have any and are called cat fishes.

Fish scales are of 5 kinds,including Cycloid, Ctenoid, cosmoid, placoid and ganoid.
Notes:
*Cold Blooded—which do not maintain their own body temperature, but body temperature varies according to the temperature of surrounding.

*Cartilaginous—Made of the tissue that is found in our nose and ear.
http://en.wikipedia.org/wiki/Fish
http://allfishblog.blogspot.com/2011/03/scales-theclothing-of-fish.html