Class Osteichthyes


 
 
Concept Explanation
 

Class Osteichthyes

This class includes bony fish, or fish with a skeleton of bone. Their characteristics are :

  • These fish have ctenoid or cycloid scales which are different from those of cartilaginous fish.
  • Unlike cartilaginous fish, they have gills covered by an operculum.
  • Their fins are membranous, while those of cartilaginous fish are fleshy.
  • Many bony fish have an air-filled swim bladder to help them float. They have a two-chambered heart.
  • Some are marine, while some live in freshwater and in most fertilization is external.
  • Most of the fish we eat, like herring, trout, carp, perch and salmon, are bony fish. Sea horse (Hippocampus) and lung fish (Protopterus) are also bony fish.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    The gills are covered by operculum  in __________________ class .

    Right Option : A
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    Explanation
    Question : 2

    Which of the following class includes bony fishes ?

    Right Option : B
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    Explanation
    Question : 3

    An organism  X is aquatic, have swim bladders to float and consist of bony skeleton is the member of _____________________ class.

    Right Option : C
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    Explanation
     
     
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