There are a lot of different kinds of fish that you can find in Assassin's Creed Valhalla, including the Small Bullhead. These fish are necessary if you are looking to complete the Elisdon Altar in Grantebridgescire, which asks you to offer 10 Small Bullhead. These fish are some of the more elusive in the game and it can be difficult to find places where they spawn. Luckily, if you are looking to catch some of these wily fish, you won't need to go very far from the altar to find a place where they do spawn. Head to the Elisdon Altar, which can be found just south of your settlement, Ravensthorpe. From the altar, just head east to the nearby river. If you move along the river and use your Odin's Vision, you will see plenty of fish swimming around. You can use a fishing rod to catch them, your bow to shoot them, or even swim out and hack at them with your weapon. Any method will get you the material you need. If you don't see any in your immediate area, just move up towards Ravensthorpe and keep searching. Also, as you swim out to loot a fish that you just shot, the others are naturally going to swim away from you. So you will have to continually reposition yourself along the bank to find their new swimming spots. It's not the quickest method, but stick with it and you will eventually have 10 Small Bullhead in your possession, or even more.