Catch Per Unit Of Effort: CPUE or CPU The catch of fish, in numbers or in weight, taken by a defined unit of fishing effort. Also called: catch per effort, fishing success, availability .

If you catch 10 fish in the first hour and 5 in the next hour the CPU has decreased by 50%.

I would keep using the beetle spin and take out the crappie. That will also let you see if you catch any LMB.