I’m not sure if anyone knows this but this is the easiest way i’ve found to tame them when it comes to using fish.

1. Go to any map of your choosing

2. Trap the fishes in Fish Baskets

3. Release, then Soul Ball or Cryo them

4. Transfer to Gen 2 or Fj (where ever the Shadowmanes live)

5. Unpod the fish into water and retrap them in baskets

Just be careful when unpodding them in hostile areas as other dinos will attack them.