Is there anyway I can correct aggressive behavior from my 11th month old game bread pitbull. The dog has started to show possessive behavior and the aggression whenever he's around a fresh killed animal or fish. The other day he was around a dead blue fish on the shore and wouldn't let me come near him, to the point where he almost charged me. I had to distract him and get his leash and was able to get him away from the fish. Outside of these circumstances is the most loving and adoring dog that I have ever owned.

Any suggestions on how I can deal with this behavior, he is an otherwise very friendly and loving dog when he is around people and never shows aggression.