How can i go about stopping vanilla mods spawning without changing the vanilla code?

 

Ive already got my mobs spawning but want to really stop the others.

 

Any help/tutorials would be nice please

ok thankyou and i would you that in my main class?

they are still spawning ive added this in to the @Init

 

//Removing Vinilla Mobs

EntityRegistry.removeSpawn(EntitySkeleton.class, EnumCreatureType.monster, WorldType.base12Biomes);

EntityRegistry.removeSpawn(EntitySpider.class, EnumCreatureType.monster, WorldType.base12Biomes);

EntityRegistry.removeSpawn(EntityZombie.class, EnumCreatureType.monster, WorldType.base12Biomes);

EntityRegistry.removeSpawn(EntityEnderman.class, EnumCreatureType.monster, WorldType.base12Biomes);

 

Edit:

 

Dont worry had to make a new world