These guys won't attack you unless you attack them. They will them group up and latch on to you, giving you the bleed effect.

I found a 4.5 size and fed it to a 150 Hesperides and it instantly tamed

If you attack one and don't one shot they will attack you I have noticed they won't if you kill one in one hit they will ignore you.

Will attack if you attack them, just stay clear of the water in general due to the amount of piranhas that spawn with them

Even if you only see one, keep an eye out for others after you've killed it.

Think of them as zombie pigmen, don't attack them unless you wanna get swarmed and messed up

Try not to hit them, because if provoked they suck your blood

U can get good blueprints when fishing

Sabertooth salmon are evil if you attack them, them and their group will attack you to. They attack intill your dead.

Don’t hit these if you just started trust me my 150 Kaprosuchus got mawled by these guys