Sardines are pretty much high in Creatine too, compared to even Steak. They are closely related to Herring (the highest creatine content meat/fish source) in the family Clupeidae.
Sardines can also be known as Pilchards depending on where in the world you are, or actually Herring itself. Some people call Sardines, European Herring or European Pilchard.
Mackerel is another good tinned fish, family Scombridae.