From Nookipedia, the Animal Crossing wiki
The Zebra Turkeyfish (ミノカサゴ, Minokasago) is a fish that can be found in the ocean during the months of April through to November, at anytime of the day. It has a small shadow, about the same size as the horse mackerel.
Donating to the Museum
Donating in Wild World
The Zebra Turkeyfish can be found in the saltwater aquarium, swimming along the sand.
Donating in New Leaf
After donating a Zebra Turkeyfish to Blathers, it will appear in the section for fish and deep sea creatures, specifically in the large tank in the northeastern room of the fish and deep sea creatures area.
Chip will say this when given a zebra turkeyfish:
The zebra turkeyfish, also known as zebra lionfish, can be found in the Indian and Pacific oceans. The venomous spines on its back are not used for hunting but instead protection from predators such as large eels, frogfish, groupers, and scorpionfish. Interestingly enough, zebra turkeyfish have no natural predators, and specifically have thirteen spines. Like other lionfish, zebra turkeyfish use their large fins to corner prey and quickly swallow them. They hunt primarily from late afternoon to dawn. Captive specimens can be fed frozen krill. Zebra turkeyfish are quite docile, with most stings a result of an unwary human stepping on one accidentally. Though not lethal, a sting from a zebra turkeyfish can be quite painful.
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