Dolphin

Raw dolphin can be fished by members who have level 90 Fishing or higher. They require level 93 Cooking to cook. Dolphins heal 200 to 2325 life points, depending on your Constitution level.

Dolphins can be seen swimming around when a player is scuba diving in deep water, the number of dolphins spawning depends on the fishing location. If wielding a fishing spear, the player can catch dolphins, by jabbing the spear at the creature until it finally collapses. Once the fish is dead, it disappears and appears in the players inventory as a raw dolphin. Currently they can only be found in the Celestial Dungeon. Just like all other spear fishing fish, catching the fish is competitive, meaning that if two or more players are trying to catch the same dolphin, then only one player will be successful in catching the fish. Dolphins give 400 Fishing experience per catch and 240 Cooking experience when cooked. Inside the Celestial Dungeon, there is a 40% chance that a Red dolphin spawns in place of a regular dolphin, which requires level 100 Fishing and gives more xp for catching.

Catching dolphins can take a really long time, so it is not advised to catch them if you are planning on leveling your Fishing, but when caught they can be sold for a reasonable price.

At level 103 Cooking, players will stop burning dolphins if they wear Cooking gauntlets or at level 107 Cooking the player stops burning dolphins(even without cooking gauntlets). By cooking dolphins, players gain about ~302,400 xp/hour, assuming they have 107+ (or 103+ with cooking gauntlets) Cooking and won't be burning any dolphins.