Gerhard these are deadly lures, I've caught shad, natal snoek, tuna and big bonnies on them off the boat. I reckon the 31g (80mm) will still cast a mile with your amia on 20lb braid. I don't see a queenie or couta leaving this lure alone, plus they sink so you can work various depths as well. I've had great success with the BHP colour. Here's a chart of colours: