Halibut Forest is the seventh stage in Sushi Island.
As soon as you start a Teacher Bear, Snache, Doge and Doge Dark will spawn, they will continue to spawn dark doge spawns in intervals of 10 seconds (I think) while the teacher bears spawn at intervals of 30 seconds (I think, it may be like 45 seconds). After you hit the base, more Doge Darks will be spawned in a faster interval (1 second or so). Also B.B. Bunnys will spawn with Those Guys (5 seconds or so).