It's actually the fish of mutation, I think your magic fishies are mixed up. To give a full list, here's all with their ability and name:
[DO NOT READ IF YOU DO NOT LIKE SPOILERS]
1 - Fertility - Greenfin Spotanus
2 - Sustenance - Speckled Leaffish
3 - Curing - Crimson Comet
4 - Growth - Oriental Goldbulb
5 - Mutation - Wasp Grouper
6 - Health - Orange Snooper
7 - The Golden Guppy of Isola - Canary Fire-Arrow