How can I save my cuddlefish from becoming fish food?

Solution 1:

The large health pool thing seems to be incorrect/a myth. They do die quickly to larger predators. Since they follow you everywhere, they tend to find themselves in dire situations quite often. You cannot heal your cuddlefish and the only way to protect it is to leave it in the tank.

And no, they cannot reproduce and there are only 5 cuddlefish eggs in the game.

Solution 2:

Theres only five in the entire game and they for me they all died due to constant stalkers coming from kelp forest to chop them or reaper attacks...Over time they will die so if you cant part to not have one because of this just do Debug Cuddle fish and spawn yourself a new one everytime it dies due to the hard grind of subnautica.