Fridge

Fridge is the fish that refuses to move. It appears during the Snowstorm admin event in Winter, carries the Special rarity, and its in-game quote is "where my chicken sandwhich", spelling included. The wiki calls it an easy catch in one sense only: it cannot travel across the fishing bar at all, yet it comes with a -99% Progress Speed penalty.

That penalty is the whole story. The wiki estimates that landing a Fridge takes roughly six minutes or more without any Progress Speed buffs. The wiki says it has a very high base and that, as a balance, it does not move. Its Progress Speed cannot be altered the normal way either, Steady included. Only the Piercing enchantment, the Overclocked enchantment, or rods with Progress Speed passives can change it.

The trivia is a meme: the dog picture on the fridge door is the "Smirking Dog", popular across social media. Other Special fish from admin events punish you more through movement, such as the erratic Ghost at -90%; Fridge goes the opposite way, a motionless target and a very long wait. The catch line fits the setting: "is there any food left?"