How to tame an X-Otter on Genesis 1, with infinite fish.

First, teleport to the North East Arctic and track the Ice Fishin' mission. It can be tracked on the tab with the exclamation point, or you can simply run down the river until you find the frozen lake. Once you find an otter you want, start the mission and jump into the fishing holes, then just kill a couple fish to tame it with. The fish respawn, so you can't run out of taming food unless the mission ends, which you can easily restart. When it's tamed, you can cancel the mission in your inventory and TP back to base.