Catfish

The Catfish (ナマズ, Namazu) is the most common lake fish. Selling for 800 Bells, the Catfish is the second least expensive lake fish. It appears from May until October and from 4 PM to 9 AM.

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Upon donation to the museum, Blathers will give a generic comment about common fish:

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It can be found in the middle-left tank in the aquarium.

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Blathers does not make a small talk about the fish in, but there is an information board for the Catfish.

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When donated, the catfish can be seen swimming around the large recessed tank in the freshwater section of the fish exhibit with the Bluegill.

Real-world information
Catfish have one of the greatest range in size within a single order of bony fish. Many catfish have a maximum length of under 12 cm. Some of the smallest species of Aspredinidae and Trichomycteridae reach sexual maturity at only 1 centimeter (0.4 in). The Siluriformes are commonly caught in real life, usually in ponds or lakes. In some fiction, it plays a pun on the name 'Catfish' by making it have the head of a cat. In some parts of the world, catfish are eaten.