Sushi is a Japanese dish built around vinegar-seasoned rice, typically combined with seafood, vegetables, or both. Sashimi is thinly sliced raw fish or meat served on its own, with no rice at all. The two are often grouped together on restaurant menus, but they’re fundamentally different: sushi is defined by its rice, while sashimi is defined by the quality and cut of the fish.
What Makes Sushi “Sushi”
The word sushi actually refers to the rice, not the fish. Sushi rice is short-grain white rice seasoned with rice wine vinegar, a small amount of sugar, and salt. That tangy, slightly sweet rice is the one ingredient every style of sushi shares. You can make sushi with cooked shrimp, cucumber, avocado, egg, or even no seafood at all, and it’s still sushi. But without the vinegared rice, it isn’t.
From there, sushi branches into several distinct styles:
- Nigiri: A hand-pressed mound of rice topped with a slice of fish and a thin layer of wasabi. This is the most iconic form.
- Maki: Rice and fillings rolled inside a sheet of seaweed (nori) and sliced into bite-sized rounds. This is what most people picture when they think of sushi rolls.
- Temaki: A cone-shaped hand roll, with rice and fillings wrapped in a single large piece of nori, eaten in one sitting rather than sliced.
- Chirashi: A bowl of sushi rice topped with an assortment of sliced fish, vegetables, and garnishes. It’s the least formal style, sometimes called “scattered sushi.”
- Hako: Pressed sushi made by layering rice and toppings in a small wooden box, then cutting them into neat squares.
What Sashimi Actually Is
Sashimi strips away everything except the fish itself. It’s raw seafood, sliced thin and served without rice, seaweed, or sauces. The focus is entirely on flavor, texture, and freshness. A plate of sashimi typically arrives with just a small mound of wasabi and soy sauce on the side.
The variety of fish used for sashimi is wide. Some of the most common options you’ll see at Japanese restaurants include salmon (sake), bluefin tuna (maguro), yellowtail (hamachi), red snapper (tai), sea bass (suzuki), and scallops (hotate). Squid, octopus, shrimp, and various shellfish also appear regularly. Each fish has a different texture and fat content. Salmon and yellowtail are rich and buttery, while tuna tends to be leaner and more firm, and squid has a clean, slightly chewy bite.
How Raw Fish Is Kept Safe
Most fish sold for raw consumption in the U.S. has been frozen before it reaches your plate, and that’s by design. The FDA requires that fish intended to be eaten raw be frozen at specific temperatures to kill parasites. The standard options include holding fish at -4°F (-20°C) for seven days, or flash-freezing it at -31°F (-35°C) until solid and then storing it for at least 15 to 24 hours depending on the method. This process eliminates parasites without noticeably affecting the texture or taste of the fish when it’s properly thawed.
Tuna is one notable exception. Certain species of tuna are naturally resistant to the parasites that affect other fish, so they’re sometimes served fresh rather than previously frozen. At reputable sushi restaurants, sourcing and handling standards are strict. The fish you’re eating has gone through a carefully managed supply chain designed around raw consumption.
Nutrition and Mercury
Raw fish is a strong source of protein and omega-3 fatty acids, the type of fat linked to heart and brain health. Salmon leads the pack: a 3-ounce serving of Atlantic salmon provides roughly 1.6 to 1.8 grams of omega-3s. Mackerel delivers about 1 gram per serving. Tuna provides less omega-3 but is still a solid source of lean protein.
Mercury is the main nutritional concern with frequent raw fish consumption. Larger, longer-lived predatory fish accumulate more mercury over their lifetimes. Bigeye tuna averages about 0.69 parts per million of mercury, and king mackerel averages 0.73 ppm. Both are considered “good choices” to eat in moderation (no more than once a week) rather than staples. Salmon, Atlantic mackerel, shrimp, and scallops all have very low mercury levels and fall into the FDA’s “best choice” category, meaning they’re safe to eat two to three times per week. If you eat sushi or sashimi regularly, choosing salmon or shrimp more often than bigeye tuna is a simple way to keep mercury exposure low.
Sushi rolls do add calories that sashimi doesn’t. The rice in a single sushi roll contributes a fair amount of carbohydrates, and rolls with tempura, cream cheese, or mayo-based sauces can push a single order well above 500 calories. Sashimi, being just fish, is one of the leanest protein options on any menu.
The Role of Wasabi, Ginger, and Soy Sauce
The three condiments served alongside sushi and sashimi each have a specific purpose, and none of them are meant to be used heavily. Wasabi contains a compound with natural antibacterial properties. Before modern refrigeration existed, it played a practical role in making raw fish safer to eat. Today, sushi chefs use it primarily to cut through the richness of fatty fish and sharpen the overall flavor. At traditional sushi bars, the chef applies wasabi directly between the fish and rice on each piece of nigiri, adjusting the amount based on the type of fish.
Pickled ginger (gari) is a palate cleanser. You eat a small slice between different pieces of sushi to reset your taste buds, not piled on top of each piece. Soy sauce is meant as a light finishing touch. Traditional practice is to dip the fish side of nigiri lightly into soy sauce rather than dunking the rice, which soaks up too much liquid and falls apart. For sashimi, a small dip is all you need.
Sushi vs. Sashimi: Choosing at a Restaurant
If you’re new to Japanese cuisine, the choice between sushi and sashimi often comes down to what kind of eating experience you want. Sushi is more filling because of the rice, offers more variety in flavors and textures (especially with rolls that include cooked ingredients and vegetables), and works well if you’re not fully comfortable with raw fish. Many popular rolls use cooked shrimp, crab, or eel.
Sashimi is the better option if you want to taste the fish itself without anything competing for your attention. It’s also lower in calories and carbohydrates. Ordering a sashimi platter is a good way to sample several types of fish side by side and learn what you prefer. Many people order both: a few pieces of nigiri or a roll alongside a small sashimi selection.