Katie had originally named her new pet Sadfish, but under her care, it wasn't long before he began to show signs of recovery - pulling back from the brink of death.
"He was sideways, floating at the top of the water when I got him," she said. "But after two days, he managed to right himself. It still took him about four days before he was willing to eat anything. But slowly, his fins started growing back, and he gained the ability to control where he was swimming."