Dododex
ARK: Survival Evolved & Ascended Companion
Utility Tips

What is a castoroides used for? castoroides battling strategies in ARK: Survival Ascended & Evolved.
Empty out their wild dams if you want them to make new ones. No refills.
Relocate them to nearby river, pond, or sea and they will make dams if they survive. New ones will spawn in to replace the relocated ones.
Boxing them in on land near water will also force them to make dam in the box, but creature eventually despawns.
Phenomenal tames. Excellent wood gatherers and I would put them up against the Bronto or Steg for berry gathering, especially for smaller tribes. They don't gather as much per attack as either of the above, but they are orders of magnitude faster. Can zip around spamming attack and be at you weight limit in berries in no time.
Built our base on The Center right next to a pond with our trough just out of range. Tamed a couple of the beavers (named Sharon Stone and Wynonna because I dare you to come up with two better beaver names) for berry and wood gathering. Still get spawns and 3 to 5 dams. Never ending supply of cementing paste, silica pearls, rare flowers, mushrooms and more wood than we know what to do with.
You could capture wild castoroides and put them in damming pens, and if you do, put them in half water half land pens. They will dam better like that. If you put more beavers in the same pen, they will, again, dam faster. This makes a good cementing paste farm, but will also give wood, silica pearls, rare flowers, and rare mushrooms. This is quite a bit of work though. If you're not into it or don't have enough resources or a good bird, you could just find an area( most likely in or near water) that beavers are around and passively build dams. When you check them, destroy them. Resources don't respawn in the same dam they already were in to the best of my knowledge. P.S. If you tame a beaver, there is no way to let build a dam ( I've tried ?)
Their saddle acts as a mobile smithy, team it up with a horse to get the ultimate travelling team. The horse saddle = a smithy and the beaver saddle = mortar and pestle so you can craft gunpowder while on horse, and then transfer that to the beaver, so you can make your grenades and such on the go.
How to build dam farm:
Needed:
12 foundations (preferably stone)
12-24 doorframe (preferably stone)
1)find an already existing dam
2)build a 3x3 box around the dam with fence foundations
3)place doorframe on top of the foundations;if the dam is underwater, put enough layers for the top doorframe to be out of the water
4)using an argie, pick up 2 to 3 beavers and drop them into the box. 2 is the minimum number needed for them to spawn a dam but I find that 3 works better. (note:if you want more dams, bring beavers from another spawn location as no more beavers will naturally spawn in that area. Its also preferable to build another box so they don't end up pushing each other out the top)
Dams will spawn around every 12 hours
Remember to not leave the items you don't want in the dam. Drop them so that the beavers can spawn a new one without having the dam demolish after a week.