Identify the fish that has to swim constantly to avoid sinking.
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a
Rohu
b
Pristis
c
Exocoetus
d
Clarias
answer is B.
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Detailed Solution
Pristis belong to the class Chondrichthyes which do not have air bladder. They have to swim constantly to avoid sinking.Rohu , Exocoetus and Clarias are bony fishes which have the air bladder. It helps in maintaining buoyancy.