Fallfish are a type of fish.
Like all types of fish, each fallfish gives one fish fillet when caught.
Fallfish can be caught with blue lures in any fishing spot, but their favorite spot is #7 (the shallow area with a floating barrel).
Fallfish can be caught in medium circles and therefore are a bit harder to catch.
See Fishing List for more detailed information.
Fallfish in the fishing book
The fallfish is on page 4 of the fishing book:
The caretaker of the lake! Likes to feed on bottom scraps and keep the place clean.