Imagine this: leedsichthys tameable and rideable. They can harvest metal and oil. They had a platform saddle. They could swallow fish hole and carry them around alive. WELL THEY ARENT TAMABLE! They would be op as a tame.
General tip works great get an Ichysauros and swim down to one hop off quick and you can “scrape it’s meat” it won’t become aggressive as long as you get back on fast but it gives you loads of raw prime fish meat and you can do it every 10 min
You can easily take an Ichthy and ride up to it, dismount and scrape, and mount again. Check if you were able to get meat or prime meat. A real killer when making narcotics! I found one by herbivore island. You might be able to see it if you jump in the water near the edge. If not, swim out in all directions except towards the main land.
When I and my Teammates decided to sail to herby island to set up base there. We didnt encountert one. But later when one of these appeart and started to use our Raft as a Chewing toy, we where able to scare it away with a Crosbow. I dont know if it was luck or these can be scared of by shooting them.