Easy fish recipes that are healthy

I have never really cooked fish for my family (frozen in a box just doesn't cut it anymore) and due to my husband and son's health I need to start serving it a lot. Can anyone give me some good recipes that center around fish that I can try making. Even simple tips on how to cook it healthy so it tastes good would be appreciated.

Here is one way I make fresh fish.

1 Tbsp. dijon mustard
1 Tbsp. light mayonnaise
1/8 tsp. garlic powder
1/8 tsp. ground black pepper
1 lb. flounder fillets
1/3 cup Planters heart healthy nut mix (it has a little salt but not too much)

I mix up the mustard, mayo, and spices and spread it over fish that I have put on a lightly greased baking sheet. Then I sprinkle on the nuts and bake it for 10-12 minutes at 400.