A mounted shark can be built in the fishing trophy hotspot of the Skill Hall in a player-owned house. It requires level 76 Construction, 2 mahogany planks, and a stuffed big shark to build. Upon building it, players will receive 350 Construction experience and 350 Fishing experience.
Players can only get a stuffed shark by fishing for shark, requiring 76 Fishing, until they get a big shark. Players must then take the unstuffed big shark to the Taxidermist in Canifis, who will stuff it for 5,000 coins. Once mounted however, the big shark cannot be reclaimed. If players remove the shark, they will receive nothing back. Jagex has stated that this is because mounting the shark rewards Fishing experience, and they did not want players to be able to train Fishing by removing and remounting the big shark.