Go to the NE corner of the purple map there is a giant lake there make fish baskets and capture piranhas. They count as well and are much easier to catch then simply fly south. You can reset a fish baskets spoil time by putting it in your hotbar and stand in water. Find your shadow and trap it with four Dino gates and doors in a tight square formation. They cannot walk through the gates so get it to teleport in or seal the trap as it's clawing you. Wait for 0830 time, Crouch walk up to it with a fish basket in your last hotbar slot and feed it by its tail. Feeding if by its head will reset tame progress.