Superboy #194 (1973)

“The Super-Merman of the Sea!”/“Prey of the Sea Wolves”/”Super-Merman’s Final Ordeal!” Written by Leo Dorfman, pencils by Bob Brown, inks by Murphy Anderson.

Harkon, a renegade Atlantean scientist, transforms Superboy into a water-breathing merman, which also removes his super-powers.

Cover art by Nick Cardy. Good condition.