A group behavior that is much more common in bony fish than cartilaginous fish is:

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Schooling behavior, where fish swim together in coordinated groups, is much more common in bony fish than cartilaginous fish. This behavior offers advantages such as better predator defense, increased foraging efficiency, and efficient swimming. Cartilaginous fish tend to be solitary hunters, or in some cases, they may form loose aggregations, but they do not exhibit the highly coordinated schooling behavior seen in many bony fish species.

A Group Behavior That Is Much More Common in Bony