NEVER and I mean NEVER FIGHT IN WATER. They will stun and all you can do is wait as you see this thing kill your lv 132 triceratops. That has killed rexs. Rip Trixie the triceratops Jan 2020- Mar 2020.
When I was a noobie in Ark I saw this guy. Like the therizinosaur incident with me thinking this guy is passive I walked up to him while he was busy dealing three raptors. He slew the raptors easily then he drew his attention to me. I was like “Hello there” and he was like “Omae wa, mou shindeiru.” He stunned and easily killed me. Lesson learned. Don’t ever, ever go near creatures dealing with other hostiles. You might save your character by doing this.
Be VERY careful with these things. They're difficult to kill at low player levels, and your best bet is to bola it and book it in the other direction. Unless you've got an ascendant bow and some high ground, you're screwed. And NEVER go into the water with those things nearby; their tail spin stuns you if the Baryonyx is in the water.