For gathering with the otter you don’t always have to pick him up and double tap F for him to gather and attack targets you can use the whistle command “attack this target” and it does the same thing but without having to pick him up and double tap F and he doesn’t have to be on your shoulders.
What I do is I throw him off my shoulders I go and kill the fish myself and once I got a good group of dead fish I just use whistle “attack this target” and he gathers the meat and pearls from the dead body. Hope this helps for anyone that was constantly picking the otter up and double tapping F to gather.
I once had an otter that I named harry otter , he was a great otter he got me all the silica and black pearls I needed, he once saved me from a megalodon , he kept me warm to, he was a great companion I took him almost everywhere,but one day I was farming pearls with him I threw him at a fish to get pearls from it but instead he disappeared I looked and looked for him only to not find him but uneven got a message that he was dead, he's still out there somewhere, I still look for him to this day. #prayforharryotter