I want to create a dangerous ocean, full of sharks... using Mo Creatures and BiomeTweaker.

Well, I created test script:
ocean = forAllBiomes()
ocean.removeAllSpawns("CREATURE")
ocean.removeAllSpawns("WATER_CREATURE")
ocean.removeAllSpawns("CAVE_CREATURE")
ocean.removeAllSpawns("MONSTER")

ocean.set("topBlock", "minecraft:sand")
ocean.set("fillerBlock", "minecraft:sand")

ocean.addSpawn("drzhark.mocreatures.entity.aquatic.MoCEntityShark", "WATER_CREATURE", 15000, 50, 60)

Which caused generation of ocean json like this:
"Spawnable Water Creatures": [
{
"Entity Class": "drzhark.mocreatures.entity.aquatic.MoCEntityShark",
"Weight": 15000,
"Min Group Count": 50,
"Max Group Count": 60
}
],

Well, I have some small bands of sharks wandering the land, in mountains, on deserts, but no sharks in the sea... can you give me a tip, why? Thank you,
Darai.

You added sharks to every biome. Only add them to the ocean.

Hello,

thanks for the quick reply.
Yes I know I created the 'ocean' as all biomes... that is because it seemed to do nothing to ocean itself, so I wanted to try if it does somthing at least to some other biome.

And it does... which is the strange thing. I just tried what you suggested and unfortunately this simple hack didn't worked.

allB = forAllBiomes()
ocean = forBiomes(0)
allB.removeAllSpawns("CREATURE")
allB.removeAllSpawns("WATER_CREATURE")
allB.removeAllSpawns("CAVE_CREATURE")
allB.removeAllSpawns("MONSTER")

ocean.addSpawn("drzhark.mocreatures.entity.aquatic.MoCEntityShark", "WATER_CREATURE", 15000, 50, 60)

Closing this because it's so old. If you are still having this issue on 1.12, please let me know.

I am having this problem on 1.12 with the current version of everything

removeAllSpawns("WATER_CREATURE") doesn't remove entries from mo creatures from the biome info files (if they are refreshed with /btoutput the original entries are still there).

Also no water creatures spawn in river or oceans - co-incidence? perhaps not.
mo creatures might be doing something weird, don't know if anyone can work out what?