Goldfish

Goldfish are Critters that swim in water, and walk on land during Rain. They can be caught with the Bug Net and used to craft several items. They can be spawned from the Fish Statue.

During a Blood Moon, or when hit with Vile Powder or Vicious Powder, Goldfish turn into Corrupt Goldfish or Vicious Goldfish, which have much more health and do attack players. This can be confusing for new or inexperienced players, as Goldfish are seen as passive.

Trivia

 * While not directly utilizing the trademarked phrase, the Goldfish's tooltip is a reference to the snack food Goldfish ("the snack that smiles back").
 * Goldfish could previously be killed and then used as a weak recovery potion (restoring 20 health), which the tooltip is a remnant of.
 * Goldfish have black eyes, but when killed have red eyes. This may be because of the blood that appears when you kill it.
 * The way Goldfish walk on land during rain may be a reference to how fish walk on land in several Dr. Seuss books.

History
Poisson doré Złota rybka Goldfish (NPC) Золотая рыбка 金鱼