Tunalock

(There is, for example, an enormous genre of fan-made visual art depicting Sherlock Holmes as an anthropomorphic tuna: collectively, Tunalock. It would confuse Sidney Paget, but I find it hilarious and rejoice in its existence.)

If the proponents of Tunalock (Holmes and Watson are fishes) or Farmlock (cows), the fans who post pictures of Martin Freeman on Tumblr and the devotees of crossover fanfic, want to claim the name of Sherlockians, they are welcome to it.

Perhaps the strangest AU is tunalock, with Sherlock as a fish wearing a scarf.