NO. i have heard of and read of people scenting pinkies using tuna to help get a corn to eat a pinkie, but not actually feeding them fish.
fish doesnt have all the nutrients that corns need. also there is a huge risk with feeding fish to any reptile...some species of fish contain an enzyme called thiaminase, which destroys Vitamin B1 (thiamin) and gives your snake a potentially fatal vitamin deficiency. also, even snakes fed mostly on fish need a supplement to get all the nutrients they need.
also many live fish are loaded with parasites which can be passed on to your snake like roundworm, pinworm, tapeworm.