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. Players have a 1/1,000 chance per bass caught to instead receive a big bass.[1] Catching one prompts the message You catch an enormous bass! instead of the usual You catch a bass.. If fishing with a fish barrel, a big bass caught will be placed into your inventory.[2]
It can be mounted in a Skill Hall in a player-owned house. Before it can be mounted, it must be stuffed by the Taxidermist in Canifis, where she will charge 1,000 coins and return a stuffed big bass to the player. They can then mount the fish using 2 oak planks. When players take it to the Taxidermist, she will exclaim "That's a mighty fine sea bass you've caught there."
A big bass may be cooked into a regular bass for the standard Cooking experience.
The benefits of Rada's blessing and spirit flakes will cause two big basses to be caught at once if either item activates.[3]
The benefits of Rada's blessing and spirit flakes now allow players to receive two big fish at once on activation.
References
^Jagex. Mod Ash's Twitter account. 13 April 2015. Archived from the original on 26 March 2019. Mod Ash: "Bass = 1/1000. Swordfish = 1/2500. Shark = 1/5000."
^Jagex. Mod Ash's Twitter account. 8 June 2022. Archived from the original on 9 July 2022. Mod Ash: "You can still receive the big fish, and it'd have to go to your inventory."
^Jagex. Mod Ash's Twitter account. 2 March 2023. Archived from the original on 2 March 2023. Mod Ash: "[Does the fishing boost from both Rada's Blessing 4 and Spirit Flakes apply towards the chance to get a Big Fish (Shark/Swordfish/Tuna) while fishing?] I believe they can double the big fish these days. Originally they wouldn't, but there was a rewrite since then that applied the bonus more widely."
^Jagex. Mod Ash's Twitter account. 21 August 2023. Archived from the original on 29 August 2023. Mod Ash: "Yeah, the answer to that question changed since March 2020 - I think we did a rewrite of the core fishing code during the installation of a League." The earliest occurence of a player reporting a catch of two big fish took place on 23 September 2021.[4] The rewrite in question likely dates from the implemention of Trailblazer League.
46 
Big fishing net
