Discover the different sizes of tuna, from small skipjack to giant bluefin. Compare tuna by size, learn about tuna can sizes, and find out how many ounces are in a can of tuna.

Sizes of Tuna From Small Skipjack to Giant Bluefin

Did you know the world’s largest tuna can weigh over 2,000 pounds? That’s heavier than many small cars! Yet most people only ever see tuna neatly packed into a can at the supermarket.

Tuna come in a remarkable range of sizes depending on the species, age, and habitat. From the relatively small skipjack tuna used in canned products to massive Atlantic bluefin prized by commercial and recreational anglers, there’s a huge difference between each species. In this guide, we’ll compare the sizes of the major tuna species, explain common tuna can sizes, and answer frequently asked questions about tuna weight and length.

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Tuna by Size

Tuna vary dramatically in both length and weight. While juvenile tuna may weigh only a few pounds, mature adults can become true ocean giants.

Tuna Species	Maximum Weight	Maximum Length
Skipjack	75 lbs	3.5 ft
Albacore	90 lbs	5 ft
Yellowfin	400 lbs	7 ft
Bigeye	400 lbs	8 ft
Pacific Bluefin	990 lbs	10 ft
Southern Bluefin	1,210 lbs	8 ft
Atlantic Bluefin	2,000 lbs	10.5 ft

While these figures represent exceptional specimens, recreational anglers commonly catch tuna that are much smaller. For example, a typical yellowfin caught offshore may weigh anywhere from 20 to 100 pounds, while bluefin often range between 100 and 500 pounds depending on the location.

The larger tuna species are powerful migratory fish capable of swimming thousands of miles each year in search of food and spawning grounds.

Tuna Size Comparison

Looking at the different tuna species side by side helps show just how much they vary.

Small Tuna

• Skipjack
• Blackfin
• Little Tunny

These species are fast growing and are commonly used for canned tuna products.

Medium Tuna

• Albacore
• Yellowfin
• Bigeye

These are popular with recreational anglers and commercial fisheries because they provide excellent table fare and put up an exciting fight.

Large Tuna

• Atlantic Bluefin
• Pacific Bluefin
• Southern Bluefin

Bluefin tuna are among the largest bony fish in the world. Their incredible size, strength, and rich meat make them one of the most valuable fish targeted by both commercial and recreational fishermen.

What Determines the Size of a Tuna?

Several factors influence how large a tuna will grow.

Tuna Species

Some species naturally remain smaller than others. Skipjack rarely exceed 75 pounds, while Atlantic bluefin can exceed one ton.

Tuna Age

Like most fish, tuna continue growing throughout much of their lives. Older fish are generally much larger than younger individuals.

Food Availability

Healthy baitfish populations allow tuna to grow faster and reach their maximum size.

Water Temperature

Warm oceans support rapid growth for tropical species, while cooler waters often produce larger bluefin tuna.

Tuna Can Sizes

Not all tuna is sold in the same size can. Depending on the intended use, manufacturers package tuna in several different sizes.

The most common tuna can sizes include:

Can Size	Typical Weight
Snack Size	2.5-3 oz
Standard Can	5 oz
Family Size	7-12 oz
Large Food Service Can	66.5 oz

The standard 5-ounce can is by far the most popular size sold in North America and is commonly used for sandwiches, salads, casseroles, and pasta dishes.

How Many Ounces of Tuna Are in a Can?

Most grocery stores sell tuna in a 5-ounce can. After draining the liquid, you’ll usually have around 3.5 to 4 ounces of tuna meat remaining.

Some brands also offer:

• 2.6-ounce snack cans
• 7-ounce family cans
• 12-ounce value packs
• Larger commercial catering cans

Always check the label, as the drained weight may differ between brands and products packed in water or oil.

Which Tuna Species Gets the Biggest?

The Atlantic bluefin tuna is widely recognised as the largest tuna species.

Exceptional fish have reached:

• Over 2,000 pounds
• More than 10 feet long
• Ages exceeding 35 years

Southern bluefin and Pacific bluefin also reach enormous sizes, although they generally remain smaller than Atlantic bluefin.

How Big Are Tuna Caught by Recreational Anglers?

Most recreational anglers won’t encounter record breaking tuna.

Typical catches include:

• Skipjack: 5-20 lbs
• Albacore: 15-50 lbs
• Yellowfin: 20-150 lbs
• Bigeye: 50-250 lbs
• Bluefin: 100-500+ lbs depending on location

Even a 50-pound tuna provides an unforgettable fight thanks to its speed and stamina.

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Tuna come in an incredible range of sizes, from small skipjack weighing just a few pounds to giant Atlantic bluefin that tip the scales at over 2,000 pounds. Understanding tuna size comparison helps anglers choose the right tackle, estimate the size of their catch, and appreciate just how impressive these fish really are.

Whether you are buying canned tuna for lunch or planning your next offshore adventure, knowing the different sizes of tuna gives you a better understanding of one of the ocean’s most remarkable game fish.

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