Plankton is not the name of a plant or animal but more of a category for any drifting organism that inhabits the middle to upper levels of the ocean, namely the pelagic zone.
Most vets do spays, neuters, bone surgeries, spleen surgery, tumor removals, and intestinal surgeries. Heart surgery and more complicated surgeries are done by specialists that requires more schooling. If you want to be a vet, you have to have REALLY good grades and Vet school is MUCH harder to get into than human medical school.
Bone infections can be tough to treat, bone surgery (and anesthesia) is often a long procedure, and both the trauma from the injury and the surgery are considerable, so expect your veterinarian to perform pre-anesthetic blood work, give pre-surgical antibiotics, and run IV fluids.