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Costco Frozen Mahi-Mahi (Kirkland) Review

A blue bag of Costco Wild Caught Frozen Mahi-Mahi, sitting on a wooden table.

Author’s note: I wasn’t paid or compensated in any way for this review and I have no affiliation with  Costco.

Two fins up!

I previously reviewed Costco’s frozen Sockeye Salmon, which was pretty dang good. Costco’s Mahi-Mahi is significantly cheaper and I do love mahi so I decided to give it a try. My wallet decided, anyway.

A hand holding a frozen Mahi filet wrapped in plastic from Costco.

The filets are individually vacuum-sealed in plastic. I thawed mine by submerging them in a bowl of water for 15 minutes or so. These are completely skinless filets, unlike Costco’s Sockeye Salmon. They also seem to already have the “blood line” removed, which is convenient.

Close-up of raw mahi-mahi filet from Costco's Kirkland store brand.

This mahi has a firm, tight texture and a verrrry pale pink color. Mine smelled super fresh, and not the tiniest bit “fishy” after defrosting. Which made me happy. Did you know that frozen fish is often fresher than “fresh” fish? Here’s an interesting article from AllRecipes about that.

A small pan with a raw filet of Costco Kirkland Wild-Caught Mahi, sitting in a pool of melted butter.

Anyway, I digress. I chose to cook my mahi in a pan with some butter and some sweet chili seasoning mix. This was quick and easy, and the fish stayed juicy and tender. I only used three ingredients: mahi, butter, and the chili seasoning blend. Ok, and some salt. That’s it. The chili seasoning is sprinkled on top of the filet, and I flip the fish over after 5-6 minutes and cook it on the other side.

Here’s a different recipe for pan-cooked mahi, if you don’t like my way. Hmmph!

Close-up of a cooked filet of mahi, with a bite removed, showing the white inner flesh.

Behold, my fish.

I mean. Look at that. Go on. It’s beautiful, and you know it.

The finished result was excellent the fish was just the right balance of firm and tender. It was moist, succulent, and flavorful (what makes mahi flavor so good, anyway?). I didn’t find any bones in mine although the package says you might!

A white plate with a large salad and a cooked filet of Costco Kirkland Mahi-Mahi.

I ate mine on a salad. Or next to a salad. Or whatever. There was salad and fish, mmmkay? It was delicious. And yes, I may or may not have artfully arranged those tomatoes to be an even intervals in my photo.

A flaked portion of cooked mahi from Costco, sitting on a white plate.

Here is what my mahi looked like in its deep insides. Super tender. Not the slightest bit rubbery. If you’re into flaking your fish, this one flakes nicely.

A fork holding a bite of Costco mahi-mahi.

The only negative thing I have to say about this fish is the portion sizes & packaging. Although there are 12 servings per bag, there are only 6 filets. Each filet is two servings. This means you will always have to thaw and cook two portions at once, since the fish cannot be re-frozen. As a single person, this is much less convenient. For a couple or family, it probably doesn’t matter.

But now you know. You’re welcome.

Nutrition Facts in Costco Wild-Caught Mahi

Nutrition facts from a bag of Costco Kirkland Frozen Wild-Caught Mahi.

Here are the nutrition facts. A 4-ounce serving (again, HALF a filet) has only 100 calories, which is excellent. You get 21 grams of protein and only 1 gram of fat. No carbs. None.

Ingredients in Kirkland Mahi

Ingredients in Costco frozen mahi, from the back of the bag.

Here are the ingredients:

  • Mahi-Mahi (Fish)

The end. I approve.

(and, it’s Wild-Caught!)

Preparation Instructions for Costco Frozen Mahi

Preparation / thawing instructions from the back of a Costco frozen Mahi bag.

Apparently, you are supposed to remove the fish from the plastic and thaw in the fridge. Ooops. I obviously did not do that.

Price and Shelf-Life

The 3-pound bag of Costco Mahi cost $22.49. Since there are 12 servings in the bag, each portion costs $1.87. There are six filets total, so each filet is $3.75.

The expiration date on the package allows me approximately 1.5 years to eat these.

This is a Kirkland Signature (Costco store brand) product, and the item # is 251704.

Dramatic Conclusion

I’ll definitely buy this frozen mahi from Costco again! Two fins up!

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