That's a good point about hooking them through the mouth with heavy current! I never thought about that. I usually fish lakes so I hook them behind their dorsal fin and then I cut half of their back fin off and scale them down one side(or even both sides if you want) This has worked well for me! If I am using goldfish, I stick the hook right through their eyes. They have stayed alive for hours(literally all night!) Good Luck Fishin!!