5 Healthiest Fish to Eat (and 5 to Avoid) are tuna, salmon, mahi, and Tilapia.

The best sustainable fish choices are healthy for you and the planet.5 to watch out for.

You should be eating fish twice a week.Eating fish is a good way to get the heart- and brain-healthy Omega 3 fats you should be getting in your diet.

There is also a concern about the environment and choosing seafood that is sustainable.If you are like me, you often stand at the fish counter wondering what is good for the planet.We did some research to find the healthiest fish to eat.

A fast-growing fish, this species can easily be repopulated and handle higher amounts of fishing.This guy is an ocean-friendly choice because the gear used to catch Atlantic mackerel is efficient and not likely to cause major habitat destruction.The fish is high in Omega 3s, a good source of nutrition, and pairs well with bold seasonings.There is a recipe for Korean Grilled Mackerel with rich Korean chili paste and fresh ginger.

Wild-caught salmon from Alaska is low in lead and mercury.To give you an idea of how well managed the Alaska salmon fishery is, consider this: biologists are posted at river mouths to count how many fish return to spawning.The fishery is closed before it reaches its limits if the numbers begin to dwindle.Alaska's wild-caught salmon are both healthier and more sustainable than any other salmon fishery because of close monitoring, strict quota and careful management of water quality.

Buying salmon in a can is an affordable way to get it in your diet.One of the best sources of non dairy calcium is canned salmon.A 3-ounce serving has 18% of your daily needs.You will want to check the label to make sure that the salmon is from Alaska.Our Quick Lentil Salmon Salad is a great lunch option.

The tiny, inexpensive sardine is making it onto a lot of lists.It is one of the few foods that is naturally high in vitamins D and E.One of the few foods that is naturally high in calcium is this one.

Pacific sardines have rebounded from being overfished and collapsing in the 1940s.You can get a taste for sardines in our delicious Fettuccine.

According to Monterey Bay Aquarium Seafood Watch, rainbow trout is one of the best fish to eat when it is farmed in the U.S.When it comes to Omega 3 content, trout ranks just under canned pink salmon and is a good source of minerals and vitamins.

Lake trout can be found from the right places.Lake trout are caught in Minnesota waters.

It has a higher Omega 3 content than fish and is a staple in the Nordic Diet.It is an excellent source of vitamins D and selenium.You can find herring canned, cured or smoked in restaurants, but it can also be eaten fresh.

Buying U.S. Atlantic herring is recommended by Seafood Watch.If you haven't befriended your local fishmonger yet, they can help you figure out the source of your fish.

Many fish are taken off the menu by environmental organizations.EatingWell highlighted popular fish that are both deplete and carry higher levels of mercury and PCBs.Some of the fish have health advisories posted by the Environmental Defense Fund.