Catfish produce ‘stridulatory sounds’ by rubbing the base of the pectoral spine against the pectoral girdle; this often happens when the catfish locks its spine as a defensive maneuver. There has been some claims that the sound of the croak changes with the location/size of the catfish. But you aren’t hurting the fish if it croaks (well, not necessarily) — think of it as akin to when turtles hide inside their shells or cats hiss.
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