Microwave temperatures vary according to make and model, be sure to read your user's guide and cook accordingly. The following are general recommendations

Preparation Fresh or thawed Fillets or Steaks
Remove head and tail of whole salmon. Place in a shallow microwave-safe dish. For fillets, thin edges should be tucked under before cooking. Cover with vented plastic wrap. Cook on high (100%) power. Cook 2 to 4 minutes per For ½ pound of ½ inch thickness fillets.Cook 5 to 7 minutes per pound of ¾ to 1 inch-thick steaks.,

SALMON WITH SHELLFISH SALMON SKEWERS