or lack both the alarm substance and the fright reaction to the alarm substance.

Weberian apparatus

In otophysians, one of the main characteristics is the Weberian apparatus. It is made up of a set of bones known as Weberian ossicles, a chain of small bones that connect the auditory system to the swim bladder of fishes. The ossicles connect the swim bladder wall with Y-shaped lymph sinus that abuts the lymph-filled transverse canal joining the sacculi of the

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