Blep fishing has an end game zone called the All Blue. 

The All Blue is a special end-game area that is created once at least one Compass to the All Blue has been created. 

• Fish caught in the All Blue are 10% larger

• Every fish in the game can be caught here, no matter the biome/weather/time.

• Everytime a fish is caught, there is a configurable chance that an ocean based mob(s) will spawn and attack the player.

In order to craft the Compass to the All Blue one must gather 7 pieces of the compass...  there are 7 different areas you can fish up compass pieces in: Cold, Temperate, Jungle, Ocean, Dry, End and Nether. Thes pieces are combined using a Smithing table to create a compass.

the biomes you need to fish within areas are as follows