How many mussels are in a 3 oz serving?

Mussels are a delicious and nutritious type of shellfish that are popular around the world. When eating mussels, it’s useful to know how many mussels are in a standard 3 oz serving. This allows you to determine portion sizes and nutritional information.

Quick Answer

There are typically around 9-12 mussels in a 3 oz cooked serving.

Calculating Mussels per Serving

To determine how many mussels are in a 3 oz serving, we need to know the average weight of a single mussel. The size and weight of mussels can vary depending on the specific type and where they were harvested. However, most mussel species range from about 0.3-0.5 oz per mussel.

For the sake of easy math, let’s assume the average mussel weighs 0.4 oz. If we have a 3 oz total serving size, and each mussel is 0.4 oz, we can divide the total weight by the single mussel weight to get the number of mussels:

3 oz serving / 0.4 oz per mussel = 7.5 mussels

So based on the average weight, a 3 oz mussel serving contains about 7-8 mussels. However, mussel sizes can vary quite a bit. So for a more accurate range, we’ll say a typical 3 oz serving contains 9-12 mussels.

Serving Size Details

Now let’s look at some more details around mussel serving sizes and weights:

  • Farmed mussels tend to be smaller, with an average weight of around 0.3 oz per mussel.
  • Wild-caught mussels are often bigger, averaging 0.5 oz per mussel or more.
  • Baby and petite mussels can be as small as 0.2 oz per mussel.
  • Large mega mussels may weigh 0.75 oz or more each.

So if you had a serving of smaller farmed mussels, you might get 9-10 in a 3 oz serving. With larger wild mussels, you may only get 5-6 in those 3 ounces. The range is quite wide.

Typical Mussel Serving Sizes

In addition to the 3 oz serving size, here are some other common mussel serving sizes:

Serving Size Number of Mussels
3 ounces 9-12 mussels
5 ounces 15-20 mussels
Half pound 18-24 mussels
1 pound 36-48 mussels

These serving sizes are based on average 0.4 oz mussels. Larger or smaller mussels would increase or decrease the counts slightly.

Nutrition Information

Now that we know about how many mussels are in a typical serving, let’s look at the nutrition profile of these delicious bivalves.

A 3 oz serving of cooked mussels contains around:

  • Calories: 90
  • Protein: 13g
  • Fat: 2g
  • Carbs: 6g

Mussels are high in many vitamins and minerals. A 3 oz serving provides:

  • Vitamin B12: 16mcg – 270% DV
  • Selenium: 49mcg – 89% DV
  • Riboflavin: 0.3mg – 20% DV
  • Iron: 3mg – 20% DV
  • Zinc: 1.5mg – 10% DV

Mussels are also an excellent source of omega-3 fatty acids, providing 430mg in a 3 oz portion.

Given their stellar nutrient profile, mussels are one of the healthiest seafood options you can eat. Their high protein and low calorie counts make them perfect for supporting a healthy diet.

Nutrition Per Mussel

You can also look at the nutrition numbers per average 0.4 oz mussel:

  • Calories: 35
  • Protein: 5g
  • Fat: 0.5g
  • Omega-3s: 165mg

The vitamin and mineral content can also be calculated per mussel by dividing the 3 oz serving stats by 9-12 mussels.

Cooking Mussels

Mussels are very versatile shellfish that work great in a variety of dishes. Here are some of the most popular ways to cook and serve mussels:


Steaming is a quick, healthy way to prepare mussels. Place mussels in a pot or pan with about a cup of water or broth. Steam covered for 5-8 minutes until the shells open. Discard any unopened mussels.


Sauté mussels in a pan with olive oil, garlic, shallots and white wine. Cook for 5-6 minutes until opened. Tomatoes, herbs and a squeeze of lemon make delicious additions.


Bake mussels topped with breadcrumbs, lemon zest, parsley and Parmesan. Bake at 400F for 7-10 minutes until hot and bubbly.


Grilled mussels make for an amazing appetizer or main course. Grill shucked mussel meat or grill still-shelled mussels for just 2-3 minutes per side.


Add mussels to seafood soups and chowders. Simmer until opened, about 6-8 minutes. Use the cooking broth as a delicious soup base.

Storing Mussels

To get the most out of your mussels, proper storage is crucial. Here are some tips for keeping mussels fresh:

  • Keep mussels on ice or refrigerated at all times. They will die if left out too long.
  • Store mussels in a colander to allow drainage and air circulation. Don’t submerge in water.
  • Use mussels within 2 days of purchasing for best quality.
  • Discard any mussels with cracked shells or that won’t close when handled.
  • Cooked mussels can be stored in an airtight container for 3-4 days.

With proper refrigerated storage, fresh live mussels should stay edible for up to a week. Just make sure to cook them within 1-2 days for superior taste and texture.

Types of Mussels

There are numerous varieties of edible mussels found throughout the world’s oceans. Here are some of the most common types you’ll encounter:

Blue Mussels

Blue mussels are the most widely available and popular mussel species. They have dark blue/purplish shells and are farmed and harvested throughout the northern Atlantic and Pacific oceans.

Mediterranean Mussels

Mediterranean or black mussels are native to the Mediterranean Sea. They have smooth, dark shells and a robust, salty flavor perfect for Italian dishes.

Green-Lipped Mussels

Green-lipped mussels are indigenous to New Zealand. As the name suggests, they have a characteristic green-hued shell.

California Mussels

California mussels live along the Pacific coast of North America. They have multi-colored shells in shades of brown, black and purple.

Mussel Production and Farming

The vast majority of mussels consumed worldwide are farmed, not wild-caught. Here are some key facts about mussel farming and production:

  • Over 3.2 million tons of farmed mussels are produced globally each year.
  • Mussels are grown on specialized underwater lines or ropes on mussel farms.
  • It takes 12-18 months for farmed mussels to reach market size.
  • Mussel farming is eco-friendly since mussels don’t require feeding and act as natural water filters.
  • Major mussel farming countries include China, Chile, Thailand, Spain, France, and New Zealand.

Mussel aquaculture is sustainable and has a much lower environmental impact than most other types of seafood farming.

Harvesting Wild Mussels

Although commercial mussel production is mostly from farms, wild mussels are still harvested from coastal areas around the world. Here are some key considerations around harvesting wild mussels:

  • Make sure to check local regulations, as many areas prohibit unlicensed mussel harvesting.
  • Only collect mussels from clean, unpolluted waters to ensure safety.
  • Take only mature mussels that are legal harvesting size, leaving small mussels to grow.
  • Be careful not to over-harvest from any one area to maintain ecological balance.
  • Clean and debeard mussels thoroughly after harvesting.
  • Refrigerate right away and use within 1-2 days for best quality and safety.

When harvested sustainably and from clean waters, wild-caught mussels can be an eco-friendly seafood choice.


Mussels are a healthy, sustainable and incredibly tasty type of seafood. A 3 oz cooked serving contains around 9-12 mussels on average. This serving provides a wealth of protein, nutrients and omega-3 fatty acids. Mussels are a versatile ingredient that work great in soups, pastas, salads, and as appetizers. Both farmed and wild mussels can be sound choices provided they are harvested and handled properly. So next time you see some fresh mussels at the market, grab a few pounds knowing how to best store, prepare and serve this amazing shellfish.

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