Greater redhorses are a type of fish.
Like all types of fish, each greater redhorse gives one fish fillet when caught.
Catching greater redhorses
Greater redhorses can be caught with purple and gold lures in any fishing spot, but their favorite spot is #7 (the shallow area with a floating barrel).
Greater redhorses can be caught in small circles and therefore are harder to catch.
See Fishing List for more detailed information.
Greater redhorses in the fishing book
The greater redhorse is on page 12 of the fishing book:
Big and beautiful, it's one of the rarest freshwater catches. Take good care of it!