Not many fish are categorized as warm food, but salmon is one of them and is very beneficial for your health for many reasons.
It's believed that salmon warms your stomach and improves the digestion system from Yakuzen perspective.
Also, it increases Qi and blood and improves your blood circulation, meaning that it can relieve symptoms related to cold sensitivity such as cold feet and hands.

Yakuzen Classifications
Nature – Warm（温）
Channels – Spleen (脾), Stomach (胃)
Flavor – Sweet (甘)

How does salmon help you?

1. Replenish Qi and blood
2. Improve your blood circulation
3. Warm your stomach and improve spleen and stomach functions
4. Reduce water retention

Good for the following symptoms

1. Fatigue caused by Qi/iron deficiency
2. Dizziness caused by Qi/iron deficiency
3. Edema
4. Diarrhea
5. Indigestion
6. Poor appetite
7. Upper stomach pain
8. Sensitivity to cold

Japanese home dishes with salmon

1. Sake no chan-chan yaki (Steamed salmon and veg with miso sauce)
   Benefits - Replenish Qi and blood /  Improve Qi and blood circulation / Warm your spleen and stomach and improve their functions / Reduce water retention

Main ingredients
Salmon, Onion, Carrot, Cabbage, Mushroom, Miso, Sake, and Sugar.

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Cautions

It's very important to know about your body conditions before choosing foods.
Do not eat too much of particular foods at once.
Do not eat the foods you are allergic to.
There are foods to avoid if you are pregnant / have a disease. Ask your doctor before you start Yakuzen.