Once killed use a sickle to get the must Prime Fish Meat.

Use a hatchet or a sword they hunt in packs

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.

An Ark dev said that these will be tameable in the future!

Tamable using fish baskets from aberration. They seem to flee from the baskets once placed. It is a good strategy to pen then in with fence foundations and walls, or kite them to a pen. Place your basket on the other side of the wall and catch.

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

If you attack one, they ALL come after you. They’re pretty easy to kill on their own, but when 20 or more are attacking you at once, it probably won’t end well.

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

You can tame them with a fish basket, catch them with fish basket and release in water and it's 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.

Place a fish basket to tame this.

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

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.

I saw one that made me not believe my eyes.
One that glimmered and shined with colors unique.
I saw one with red scales so bright,
That became every color of the rainbow under the light.
I chased and pursued it, but never caught up.
Until one day I found it again.
And let’s just say,
It lives in the lake inside my base today.

You can tame with basket from aberration then keep in a holding pen for easy on demand prime fish meat

They can be tamed on Aberration by placing a fishing basket in the water, waiting about 30 seconds, and interacting with the basket when relatively close

Trap them in the shallow water so they cannot go anywhere and just place the bucket on the top of them. Bam. Tamed Sabertooth Salmon

Good source of prime fish meat when using a sickle

U can get good blueprints when fishing