to be clear, if i were to catch one of my dad's pike in the near future, we are looking to open the mouth as wide as possible, like with a spreader, measure "cheek to cheek" width, as well as height at the largest open space, and then total length of the fish, right?

Mind if I ask why we are collecting this data?

Trying to help with 7.5 Acres in the Chain of Lakes Illinois
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The fish would stay out of trouble if it could just keep its fool mouth shut.
Turns out there is a lot I should be learning from the fish.