On mobile if you ride an itchyosaur anglers don't agro on you even if you attack them

It seems there is a strange circular underwater hill near herbivore island that is apsolutely crawling with anglers, how many does that mran? Well I've seen about the entire rest of the ocean's population of anglers all at that hill

On valgero there all in the abberation cave

Angler fish have the bright antenna, so look out for that whe. Trying to locate one.

For some reason, they aggro Kairukus (Penguins) when in the wild. Aberrant versions can and will attack you in surface waters as well, learned that they aggro Kairukus by summoning an Aberrant Angler and then a Kairuku in front of it then it aggroed it! (The Kairuku was wild)

The dilophosaurus of the seas...

The terror birds of the sea the are extremely annoying just like the terror birds on land

Use a bow to kill em you can find them deep under water

Anglers are found in the deeper parts of the ocean, finding them is as one would guess easy as their lures are easy to see at a distance, they are comparatively easy to kill for gel ( taming food for Mantas and the best fuel in game ) but in groups exceeding three then I suggest running, best take a megaladon.
Also can be lured by other tamed anglers lures.