The golden mystery egg is an item that rewards a random golden egg for a player-owned Aquarium. One can be obtained from golden prawn crackers, a rare reward (0.5%) directly from prawn balls, a very rare reward from fishing in Prifddinas, or as a reward from the Motherlode Maw. One golden mystery egg is also given by the Prawnbroker as a tier 2 reward from the prawn perks. It can be identified to obtain a random golden fish egg that you have not already unlocked, with no Fishing level requirement.
If a player has added all possible fish to the aquarium and tries to identify a golden mystery egg, they receive a chat message "You have already collected all golden fish eggs. This egg can be kept for when you reset the progress in your aquarium by prestiging and pulling the plug." The Motherlode Maw has a chance of handing them out until max prestige is reached.
This can be obtained and identified even without a prawnbroker built by having someone use a golden cracker on the player.
- ^ There is further information on this drop; see the associated page for details.
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- The golden mystery egg is a mermaid's purse - a shark's egg case, despite possibly being identified as any of the fish eggs in the game.