A mounted swordfish can be built in the fishing trophy hotspot of the Skill Hall in a player-owned house. Upon building it, players will receive 230 Construction experience and 230 Fishing experience.
Players can only get a stuffed swordfish by fishing for swordfish, requiring 50 Fishing, until they get a big swordfish. Players must then take the head to the Taxidermist in Canifis, who will stuff it for 2,500 coins. Once mounted however, the big swordfish cannot be reclaimed. If players remove the swordfish, they will receive nothing back. Jagex has stated that this is because mounting the swordfish rewards Fishing xp, and they did not want players to be able to train Fishing by removing and remounting the big swordfish.