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Distinguish between bony fish and cartilaginous …

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Distinguish between bony fish and cartilaginous fish

    • Posted by Ujjawal Sharma 4 years ago

    CBSE > Class 11 > Biology
    • 1 answers

    Yogita Ingle 4 years ago

     CARTILAGINOUS FISHES  BONY FISHES
     1) Their endoskeleton is primarily made of cartilage. 1) Their endoskeleton is entirely made of bone. 
     2) Their exoskeleton is made of placoids. 2) Their exoskeleton is made up of cycloids or thin bony plates. 
     3) The position of their tail is heterocercal. 3) Their tail fin is homocercal. 
    4) They have 5 gills that are overly exposed (no operculum). 4) They have an operculum on either side of their gills.
    5) In them the fertilization is through internal mechanisms. 5) They fertilize their eggs externally. 
     6) Eg- dog fish, electric ray torpedo and sharks. 6) Eg-  fying fish, globe fish and sea horses.

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