I recently had my scale go kaput :sad2:. Going to be about 2 weeks before the budget will let me buy the scale I want. If I go fishing and catch a decent one i proly can estimate by looking. I hace seen formulas estimating fish weight by multiplying length x girth by what else I don't know. I was wondering does this formula work good on catfish? Is there any diffence between species in this formulas and what the heck is the rest of it?