With the current structure, any species may be weighed for big fish. It may be won with any species.
The saugeye pot is taken by the largest saugeye, but if the heaviest fish for the day is a catfish, it will take the big fish pot.
Example:
Crappie Pot: 3 fish weighed for 1.58 lbs. Winner- John Keirn
Saugeye Pot: 2.32 lbs. (Only one fish is weighed) Winner- Aaron Lewis
Big Fish: 3.34 lbs. Channel Catfish Winner- Bobby Green