fish Characteristic
Characteristic of fish
Fish are aquatic vertebrates that have vertebral column called spine. A classic fish is a torpedo shaped. The fish contains head containing a brain and sensory organs, a trunk with a muscular wall surrounding a cavity with the internal organs and a muscular post-anal tail. The following are the general characteristic that all the fish species posses:
All the species of the fish found in the world are classified into the following three groups. They are:
Each type of fish has its own characteristic based on the group they belong. So it is easy to study the characteristic of a fish based on their group.
Agnatha class:
Jaws are absent
Fins are absent
Skeleton is made up of cartilage
Posses round eel like body
Absence of swim bladder and gill covers
Soft skins made up of scales
Oviparous animals
Found in marine and fresh water
Chondrichthyes class:
Cartilage make up the skeleton
Body is covered with triangular placoid scales
Posses ventral subterminal mouth
Fins are stiff and non-flexible
Absence of swim bladder
Internal fertilization
Found only in marine water
Osteichthyes class:
Bones make up the skeleton
The gills are covered with operculum
Swim bladder is present
Fins are made up of rays and spines
This species posses different types of scales
External fertilization
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