A big bass is an abnormally large bass caught while big net fishing at any big net/harpoon fishing spot. Since players can only get it while fishing for bass, it requires 46 Fishing to catch. Big bass are a very rare catch (1/1000), and catching one prompts the message "You catch an enormous bass!" instead of the usual "You catch a bass."

To stuff the big bass, players must take it to the Taxidermist in Canifis. She will charge the player 1,000 coins and turn it into a stuffed bass. Once its stuffed, players can mount it in their Skill Hall at 36 Construction, using a stuffed bass and 2 oak planks, producing a mounted bass.

A big bass may be cooked into a regular bass for the standard cooking experience.

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