RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Pike
The Old School RuneScape Wiki also has an article on Pike.

Pike is a type of fish that can be cooked by using a Raw Pike on a range or fire at level 20 cooking, yielding 80 cooking experience. It heals 8 hits when eaten.

The raw version can be fished using a fishing rod and bait at level 25 fishing. When caught it gives 60 fishing experience.