Can any fish be eaten raw if it's frozen at home?

No. Home freezers don't reach the temperatures that statutory bodies, such as the FDA, recommend for parasite destruction. The fish needs a temperature of -15 °C for a week, or 0°C for 15 hours.

Is sushi-grade fish actually safer?

‘Sushi-grade’ is an unregulated marketing term, not a legal safety standard. Safety depends on sourcing, handling, refrigeration, and parasite-control measures such as commercial freezing.

Is sushi fish 100% raw?

No. Sushi refers to vinegared rice and may contain raw fish, cooked seafood, vegetables, egg, or tofu. Raw fish served without rice is called sashimi.

How do the Japanese not get sick from raw fish?

Safety relies on fresh sourcing, strict cold-chain management, hygienic handling, species selection, and commercial freezing practices that reduce parasite risks before the fish reaches consumers.

Written by

Neelanjana Mondal

Copy Writer

This International Sushi Day, Learn About
Sushi Grade Fish
And Eating It At Home

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Quick Summary

International Sushi Day falls on June 18 every year, and if browsing through restaurant menus for sushi raises your hackles, then use this day as an excuse to finally try making sushi at home. The Japanese make it look effortless because they are trained in it and raised in a culture where sushi is an integral part of their food. Here’s making it easy from what ‘sushi grade’ fish actually means, where to buy it, and whether raw fish is safe to eat outside a restaurant.

Deep Dive

Before getting into the origin of International Sushi Day or even picking fish for sushi, a detour with sushi’s origin is in the cards. Sushi dates back to roughly the 9th century, when the Japanese practised a method called ‘narezushi’, the ancestor of modern sushi. This technique was used to preserve (freshwater) fish through fermentation with salt and rice. The gutted and salted fish would be packed in fermented rice, with the rice later discarded, and the fish eaten.

It wasn't until the 14th century that the idea of eating fish and rice jointly emerged. The modern form arrived much later, in 1820, when a chef named Hanaya Yohei created nigiri-zushi by hand-shaping vinegared rice and topping it with marinated or cooked fish, a method fast enough to serve in minutes and the foundation of the sushi eaten today. As for International Sushi Day, it was a much more recent occurrence, founded by Chris DeMay in 2009, who was managing a Facebook fan page for sushi.

What Does Sushi Grade Imply?

‘Sushi’ or ‘sashimi-grade’ are common terms used to identify seafood perfect for eating raw, but there is no official, regulated standard behind either term. Experts note that while this sushi-grade fish comes up in conversations regularly, it really just means the fish is considered safe for raw consumption.

Safety varies by fish species and products, as fish contain different nutrients and chemicals. So many chefs, for this reason, have done away with the term ‘sushi-grade’, because this standard can vary, even within the same fish species. The label is not a guarantee, as one needs to consider the freezing history, sourcing, and handling of the fish used for sushi.

Raw Fish Needs to be Frozen Properly

When preparing dishes that use raw or lightly cooked fish, food safety is critical because fish are often riddled with parasites that can pose a health risk to humans. Freezing can help reduce this risk, as many wild species, such as salmon, cod, and even mackerel, can host tapeworms. Commercial seafood suppliers typically use specialised freezing equipment capable of reaching temperatures much lower than most household freezers.

Because home freezers may not consistently reach these temperatures, experts recommend buying sashimi- or sushi-grade fish from reputable suppliers rather than attempting to prepare raw fish from freshly purchased fish frozen at home. Consumers should also ensure seafood is sourced from licensed vendors and handled hygienically throughout storage and preparation.

What Happens if the Fish Isn't Sourced or Cured Well

There are statutory food safety bodies in every country. In India, it is the Food Safety and Standards Authority of India (FSSAI). When raw fish is not properly sourced or cured, especially when trying a sushi recipe, a person is exposed to parasites that feed on fish and pose a risk to humans. The most common concern is anisakiasis, caused by a roundworm called Anisakis. Anisakis can be found in over 200 species of fish, eel, and octopus, and eating raw seafood contaminated with it means ingesting live larvae.

The onset isn't always immediate, which makes it easy to miss the connection to a meal. Symptoms can begin anywhere from one hour to two weeks after eating contaminated sushi, typically starting with vomiting and abdominal pain as the larvae attach to the stomach lining, and in more severe cases, the pain can resemble appendicitis or, rarely, cause bowel obstruction.

Some people also develop an allergic response to the parasite itself, which can include hives, breathing difficulty, skin rashes, and in severe cases, anaphylaxis. No medication treats it directly; there are no antibiotics or pills for Anisakis, and in very severe cases, the worm has to be removed surgically.

Research has found Anisakis larvae in significant amounts in certain wild-caught fish species, including salmon and mackerel, even at high-end sushi establishments. This has increased 283-fold in marine ecosystems since the 1970s. Reported cases are still relatively rare, but they are on the rise. Doctors have specifically flagged that while anisakiasis was historically concentrated in Japan, it has become more common in countries where raw fish consumption is growing.

Choosing Fish for Making Sushi at Home

First, make sure you are doing your bit to keep the fish safe from everything after purchase. All seafood intended for raw consumption should be blast-frozen at -35°C for at least 15 hours or conventionally frozen for 7 days, both of which kill the parasite. Buying fish that skipped this step, including anything caught and eaten at home without commercial freezing, removes that safety margin entirely. Here are some tips when buying the fish.

Ask the fish seller whether the fish has been commercially frozen and how it has been stored and transported.
Tuna varieties such as yellowfin, bigeye, albacore and bluefin are commonly used for raw preparations because they are generally considered lower-risk species.
Farmed salmon is often preferred over wild-caught salmon for raw consumption due to its lower parasite risk.
Salmon, herring and several wild-caught species can carry parasites, while freshwater fish are generally not recommended for raw consumption.
Pregnant women, older adults, young children and immunocompromised individuals should avoid raw or undercooked seafood.
Buy seafood from reputable vendors that maintain proper refrigeration, hygienic handling practices and a visible cold chain.
Fish should be stored at chilled temperatures, while frozen seafood should be maintained at -18°C or below. Temperature control is one of the most important factors affecting seafood safety and quality.
Check for signs of freshness, including firm flesh, clear eyes, bright red gills and the absence of strong fishy odours.
Avoid fish that has been left unrefrigerated or displayed without adequate ice or cooling.

FSSAI guidance emphasises hygienic handling of raw fish, prevention of cross-contamination, and proper temperature control throughout the storage, transport, and retail sale of fish and its products.

The Different Sushi Types You Can Try at Home

The word ‘sushi’ encompasses several regional types, and knowing the differences helps when deciding what to attempt at home versus what to order out.

Type	Description	Difficulty Level
Nigiri	Hand-shaped vinegared rice topped with a slice of fish	Moderate Patience need with rice shaping
Maki	Rice and fillings rolled in nori using a bamboo mat	Easy Most beginner-friendly sushi
Uramaki	Inside-out roll with rice on the outside, nori inside	Moderate Needs a plastic-wrapped mat
Temaki	Hand-rolled cone of nori filled with rice and ingredients	Easy No rolling mat required
Sashimi	Raw fish sliced and served without rice	Easy Requires the highest-quality fish

For a first attempt at a sushi recipe at home, maki or temaki are the easiest choices, since they don't require the precision that nigiri-shaping demands.

Celebrating International Sushi Day

Common ways people mark the day include visiting sushi restaurants or ordering their favourite sushi rolls at home, making sushi with friends or family, and hosting sushi-making classes. A growing number of people also use the day to learn more about sushi recipes, try temaki for the first time, attempt to shape nigiri, or simply read up on what makes raw fish safe before committing to trying it at home.

FAQs

Pregnant individuals and anyone who is immunocompromised should avoid raw seafood entirely, and freshwater fish should never be eaten raw, regardless of freezing.