Salmon is a big fish so mercury could be a worry but other than that I would say go for it. On the other hand per ounce chicken will giv you more protein.

Go with tuna and chicken.

The comment about the mercury is right on, but in combination with other foods, such as Tuna, chicken, etc..., Salmon can be a nice addition to a diet. The fillets are high in essential fatty acids and will not make you gain any extra weight or fat. In fact, the fatty acids in the fish assist our body in burning fat - Fat is burned in a Fat furnace.

Eating 3-4 fillets a day is probably too much and most likely, you will lose the taste for it after a while. Add in some Tilapia, catfish, Cod, and other fishes into your diet. This will potentially alleviate your taste buds from getting "soured" on salmon. Also, these other fishes are not as high in mercury as salmon.

I would not worry too much about the whole mercury thing, I think you are taking in quite a bit of fat just in your salmon. 4 filets, I am gonna assume will be around 80g of fat or so. I dont know what the rest of your diet looks like though, but I would add some variety

This is what my diet looks like:

5:15 AM 20g Protein Shake / BCAA's

5:30 AM 30 Minutes of Cardio

6:30 AM 1 cup of Oatmeal / 7 to 8 Eggs - 6 to 7 egg whites and 1 full egg / slices of green pepper and onion

10:00 AM Protein Shake / 1 tablespoon of flax seed oil and 1 table spoon of natural PB

12:00 PM 2 Chicken Breast or 2 Pieces of Salmon Fillet / 1 cup of long grain brown rice

2:00 PM "2 cans" Tuna or Salmon salad w/ FF mayo and brocolli mixed in

4:00 PM 2 Chicken Breasts or 2 Salmon Filets
4:30 PM Protein shake with 40g protein/1Table spoon of nat PB/ 1/2 cup of oatmeal

5:00 PM Workout

6:30 PM Protein shake with 1/3 cup of dextrose

7:15 PM 2 Chicken breast / 1/2 Yam / 1 cup steamed Veggies / 1/2 Cup long grain brown rice

9:30 PM 1 Cup Cottage cheese / 1 Tablespoon of Flax seed oil