For Pirhana, I'd just troll with a small hunk of meat on a small hook. Make sure he uses pliers to get them off the hook. Their teeth are razor sharp, and they'll take a chunk out of your finger faster than you can imagine. As a former owner of a Red-Belly, I can personally attest to it.
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The vet said I should get my dog fixed.
I didn't realize he was broken.