Which among the following is incorrect about Osteichthyes?

Which among the following is incorrect about Osteichthyes? Correct Answer Gills are separate without operculum

Swim bladder helps them retain buoyancy. Many of them are edible. Gills have operculum. Skin covered with cycloid/ ctenoid scales. Most of the Osteichthyes like Katla and Rhono are edible.
Bissoy MCQ

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নিচের কোনটি Osteichthyes
The number of gills present in Osteichthyes is _________
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