chunks of raw yellowfin tuna saku
yellowfin tuna saku searing in pan with sesame seeds
yellowfin tuna saku sushi with vegetables on a black plate
four raw yellowfin tuna saku squares topped with seared tuna saku pieces and herbs on top
yellowfin tuna saku nutrition info

Yellowfin Tuna Saku

Contains one 10-12 oz. portion

Regular price$28

  • $20 off all new orders | Use code KS20

In Japan, “Saku” means block. Due to its uniformity, Tuna Saku is the preferred product for sashimi, ahi sushi, and pan searing. Our thin, center-cut Yellowfin Tuna Saku is prized for its tenderness and sweetness, making it particularly ideal for nigiri.

Our KS Signature Yellowfin Tuna Saku has a more pronounced taste than other tuna species due to the higher fat content and because we harvest and process within hours of being landed. In fact, Yellowfin sashimi is a delicacy that is often served in high-end seafood restaurants.

We all know how healthy seafood is to eat; however, to enjoy it fully, we recommend the following suggestions to Make It Easy!

Fish Fillets

- Sear Medium to High

- 3 to 5 minutes

- Max Finish Temp 145°F

Fish Portions (6-8oz)

- Broil or Bake (350°F Pre-Heated)

- Bake Time 12-20 mins (Thickness)

- Max Finish Temp 145°F

- Seafood Should be Flaky


- Sear Medium to High

- 3 to 5 minutes

- Finish Temp 130-140°F



- Sear Med. High to High

- 45-90 Seconds per side

- Finish Temp 120°F



- Pre-Heat Oven to 350°F

- Baked for 15 minutes

- Use a meat thermometer (140-145°)

- Brush with butter frequently


- Boil Salted Water

- Reduce to Low Bubbling

- 3 to 5 Minutes (3-6oz Tail)

- Add 1 minute for each additional ounce

- Cool immediately in ice water

Please Note: The above guidelines are suggestions only. The average time depends on the size/amount of seafood portions. Stoves and pans also vary in performance, so check color and texture regularly to achieve perfectly cooked seafood. Please use a meat thermometer for accuracy.

Thawing frozen seafood properly is significant not only to ensure the quality of the seafood but also to prevent health risks. For example, all of our seafood has a protective glaze of water to prevent freezer burn-in to ensure quality. Once thawed, gently pat away any excess moisture from the glazing as soon as possible.

We recommend that you follow the USDA’s instructions on safe food handling, which can be found here. We also recommend that all cooking instructions are followed and that you use a food thermometer to ensure that all seafood and other applicable items are cooked to the USDA’s recommended internal temperatures, which can be found here.

Here are a few simple ways how to defrost:

The Refrigerator Method

It might be the longest, but thawing seafood in the refrigerator is undoubtedly the safest way to thaw any protein such as seafood. It also protects the quality of the seafood, providing the best quality-control method. For example, for our Individual Frozen Portions (IFP) or Individually Quick Frozen (IQF) bags like our shrimp and scallops, it can take up to 12- 24 hours to thaw. Please remove from the original package, plate, and cover, or at a minimum, puncture the plastic packaging. Once melted, seafood lasts up to three days in the original packaging. Do not refreeze after thawing.

The Water Method

Here’s how it works:

IFP Portions: Place the seafood in a bowl of cold water (not warm or hot as that starts the cooking process) in the kitchen sink. Change the water now and then or place a constant drip/spray of water to control the temperature. Check the seafood after one hour – it should be fully thawed by then. Cook immediately after thawing.

IQF bags:

Place the desired quantity of seafood (scallops/shrimp) that you will use into another resealable bag.Replace unused IQF seafood immediately back into the freezer.Submerge the sealed bag in a bowl of cold tap water.Let the bag sit in the water until it’s completely thawed, changing the water every 30 minutes, if necessary.

We don’t recommend running under cold water outside of the bag. Cook immediately after thawing.

The Microwave Method

Not always the favorite way, but it’s fast, and the microwave method is undoubtedly the quickest of the three. Still, it’s the least preferred method to preserve the seafood’s quality. But if you forgot to take it out of the freezer and are in a hurry, here’s what you do: make sure you puncture the plastic before placing it in the microwave. Use the “Defrost” function and set the time according to weight. Cook immediately after thawing.

When will my order ship?

If your location is in the western half of the United States, and your order is received by Tuesday at 9:30 AM EST, your order will shipped on Tuesdays to arrive by Thursday. (Locations nearest our shipping facility in Salt Lake City may receive your order the next day.)

If your location is in the eastern half of the United States, and your order is received by Wednesday at 9:30 AM EST, your order will shipped on Wednesday to arrive by Friday.. (Locations nearest our shipping facility in New Jersey may receive your order the next day.)

If you need help or have any questions, please get in touch with us at or send a text to +1-877-820-0987.

We will keep you updated via email regarding your order. You'll receive an email with tracking information when your order ships, is out for delivery, and arrives to your door.

Orders must be $129 or more after all discounts and before any tax. All Orders receive FREE SHIPPING.

We can offer expedited shipping at a additional cost. Please contact customer support here.

Where do you ship?

We ship anywhere in the continental U.S., as long as it has a street address, not a PO Box


Only From Harvesters We Trust

Our KS Signature Yellowfin Tuna is hand-caught by fishermen in the pristine Laccadive Sea located between the Maldives and Sri Lanka and the Java Sea off the coast of Indonesia, and off the coast of Vietnam. Because they are hand caught, there is no harm to any by-catch, and each tuna is pulled onto the boat and iced immediately.

The catch is brought back to shore as soon as possible to greatly reduce the stress on the tuna and increase the quality significantly as compared to “long line” tuna.

Our KS Signature Yellowfin Tuna leads the way for food safety and quality because of our commitment to never using any additives and our uncompromising harvesting methods and processing protocols.

Our Seafood Has a Story.

two raw rainbow trout fillets
Rainbow Trout Fillets

Two fillets of the Andes Mountain Region, with a mild & delicate flavor.  MUST ADD "3" TO YOUR CART!

two raw branzino fillets
Branzino Fillets

Two Aegean Sea fillets with a moist & flaky sweet flavor. 

chunks of raw yellowfin tuna saku
Yellowfin Tuna Saku

A “Saku” block of Sashimi quality tuna. Tender, sweet flavor, be your own Itamae.

$10 E-Card

Get free seafood!


It's easy, refer your seafood-loving friends & family to get KnowSeafood delivered right to their homes, and you both receive $25 off your next order.

give $25, Get $25
Customer Reviews
4.6 Based on 16 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
United States

Robert B.
United States United States


Great fish, sashimi at home!

Gale C.
United States United States

Excellent choice

This tuna is wonderful and so special. Love it.

Susan M.
United States United States

Saku Tuna

Excellent! My favorite!!

Barbara G.
United States United States


The fish was fabulous, tasty and delicious. Nicely packaged and shipped

Susan M.
United States United States


Love this the most!!

Simon F.
United States United States


I was excited for sushi night with my friends but the delivery was a day late and the fish was thawed out and there was no dry ice left. I gave it the benefit of the doubt and opened the package and it smelled. It was also very light color. I couldn’t find a number to call so I messaged on messenger and than was blocked so I couldn’t contact the company.I payed a lot of money for fish I couldn’t eat.

Chris S.
United States United States

Too many purchases required

The fish was good, but your business model requires too many purchases for my liking. You offered free shipping with $150 purchase (maybe $120, I can’t recall), but your website would not allow me to check out until I hit that mark. I feel like this was intentionally manipulative. I will consider using this service again, but I will know what I’m in for before I start the process.

Stephen P.
United States United States

Simply the best

Everything Know seafood sells and delivers is second to none! We are always pleased with every order!!

Cynthia K.
United States United States

Tuna saku

Only buy my tuna from know seafood. It arrives well packed and is always fresh. No problems at all!! Thank you know seafood!

Elaine M.
United States United States

Excellent Tuna

It's not easy finding tuna of this quality. Like all of KnowSeafood's fish, it arrived perfectly packaged, always fresh and delicious. I couldn't find this quality at my local market and am thrilled that I can get this tuna delivered.

A KnowSeafood Customer
Mary E.
United States United States

Fresh delicious fish

This is one of my favorites. We make sushi, sashimi, poke or wrap it wonton wrappers and serve as a pre dinner appetizer. Highly recommend!

Philip T.
United States United States

Very nice product

I made sushi and sashimi last night... I was so happy!!!

Bruce S.
United States United States

What Is BEYOND Delicious?

KnowSeafood’s Yellowfin Tuna Saku is the answer to question posed. Turned it into poke with a perfectly ripe avocado and arugula micro greens, our new fav addition. I cannot overstate the degree to which KnowSeafood has improved the quality of my life. KNOWING there is always a delicious seafood dinner in the freezer, 30-40 minutes away via defrosting in cold water, is the degree of food comfort I have ever experience.

Dick K.
United States United States

Yellow fin tuna

Better than expected. Not sorry I ordered. Will make an order again soon.

United States United States

Excellent pick

Syper fresh and delicious