I was thinking about fixing my Eng Springer Spaniel. Will this affect his hunting, training abilities?

No to both.

Shouldn't be a problem... Until he sees that new female English Springer Spaniel down the road and realizes that he has a problem... In that case you simply need a pet psychiatrist and a boat load of cash...

Actually just the opposite. By having him neutered you will have one less distraction to worry about if there is a female in heat anywhere near where he is being trained or is hunting. Plus he won't be humping every stuffed animal in the house like my 7 month old shorthair now is.

Why don't you buy him a blow up poodle?

He will be fine for sure.
I also have a Springer. He's a 6 yr old intact male that has sired one litter of 6.
My 2 buddies have 3 of the males andall have been fixed and they continue to hunt well. Never noticed any changes in their hiunting abilities.

Plus there isless to be concerned when they come in contact with another intact male. Something I always try to avoid when in the field.
My male is a big Springer - almost 60 pounds and is a dominate male who never backs down. He is also a teriffic meat hunter, absolutely relentless,that lives to be in the field but I do have to be aware that he is intact and will react like other intact males.

One other note: If you have no desire to mate your Springer, I would have him fixed.

Good Luck.

Good advice from Jimmy S.

How old is the dog? If he is mature and you are looking to change certain behaviors it may not work. Much of the sexual/dominance type behavior is hormone driven but it is also learned so neutering and older dog will not likely change him much.

No getting him fixed will not affect his hunting ability. I am not very familiar with ess, but certain breeds are prone to testicular cancer. so by getting him fixed you eliminate that possibility.

My parents had fake nuts put in there dog because they were afraid he would act different.

My GSP has been fixed since he was 6 months old. He still hunts like a banshee.