The Lamprey (hope i spelled it right) attacks me (sticks to me) and deals small damage.
After i killed it , i still get damage and damage and damage till i'm dead.

The only way i can prevent this is quit game and relog into the world (in main menu and back in world)

Is this a bug or is it meant to be?

Besides that the Lamprey kills all water animals besides Normal Fish
For Example

• Eel's
• Squid's

They are all dead after seconds.

Maybe you can fix this too, so that it takes much more time or that the Lamprey only attacks players or something like that.
I need some Squid Inc and Eel's would be nice to see too.

• Modpack used: The Progressor (all mods updated)

• Minecraft Version: 1.18.1

• Architectury API Version: 3.6.17

• Platform (Forge/Fabric): Fabric

• Fabric Loader Version: 0.12.12

• Fabric API Version: 0.46.4

• Mod Version: 11.0.4

The after death issue is one I thought I have fixed several times, I am not sure why it is still happening. I will investigate more.

As for lampreys attacking other fish, they use our entity hunger system - they will only attack things occasionally when they are "hungry". This is to add realism and a feeling of living creatures, rather than animals that sit around waiting for the player to interact with them, similar to how wolves hunt sheep in vanilla. We have implemented features like hunger and a drop-blocking system (things that are killed by the lamprey will not produce drops, to prevent ocean item clutter) to make this as gameplay-unintrusive as possible, and thus I don't think it is an issue.

I think this is a good idea , but the ting is , there are so many lampreys and they are hungry every single second (not quite)

I've seen a lamprey killing Eel, than 3 seconds after he went to the next Eel and killed him.

So maybe you could do his hunger up , so he is hungry after 1 minute or more

*Salmons will get killed too

The thing is 1 Lamprey is not a proplem but there are so many that all other water animals get killed after time.

So you have a base and some rivers and after time there are only lamprey's in the river

Is there an option to disable lamprey's ? I know they are there for a reason but i think they are too crazy. Can i disable them?

Yes, use the config.