Rudds are a type of fish.
Like all types of fish, each rudd gives one fish fillet when caught.
Rudds can be caught with green and gold lures in any fishing spot, but their favorite spot is #2 (the reedy area with some water lilies).
Rudds can be caught in small circles and therefore are harder to catch.
See Fishing List for more detailed information.
Rudds in the fishing book
The rudd is on page 11 of the fishing book:
Always fashionable in red and gold, nothing can shake this old-school fish's confidence!