Yellowtail contains low to moderate levels of mercury, generally falling between salmon (very low) and albacore tuna (high). It is not considered a high-mercury fish for most people. However, yellowtail occupies an unusual gap in official U.S. monitoring: the FDA’s mercury database and its fish consumption advisory chart do not include yellowtail by name, which makes pinning down an exact number harder than it should be.
Why Yellowtail Is Missing From FDA Data
The FDA maintains a comprehensive database of mercury levels in commercial fish and shellfish, covering dozens of species tested between 1990 and 2012. Yellowtail is not among them. The agency’s fish consumption chart, which sorts species into “Best Choices,” “Good Choices,” and “Choices to Avoid,” also omits yellowtail entirely. The FDA has stated that species missing from the chart simply lacked enough reliable mercury data to be included.
This creates a frustrating situation for anyone eating yellowtail regularly, especially at sushi restaurants where hamachi (Japanese yellowtail) is one of the most popular items on the menu. Without an official FDA classification, you have to piece together the picture from what’s known about the fish’s biology and independent testing.
What “Yellowtail” Actually Refers To
The name yellowtail covers several related species, and mercury levels vary between them. The most common ones you’ll encounter are:
- Hamachi (Seriola quinqueradiata): Japanese yellowtail, almost always farm-raised. This is the yellowtail you get at most sushi restaurants. Because farmed hamachi is harvested young, typically at 1 to 2 years old, it has had less time to accumulate mercury from its diet. Younger, smaller fish consistently carry lower mercury loads than older, larger ones of the same species.
- Hiramasa (Seriola lalandi): Also called yellowtail kingfish or California yellowtail. This species is both wild-caught and farmed. Wild-caught specimens grow larger and live longer, so they tend to accumulate more mercury than farmed hamachi.
- Greater amberjack (Seriola dumerili): Sometimes sold as yellowtail, this is a larger predatory fish that can exceed 100 pounds. Amberjack carries higher mercury levels than the smaller yellowtail species because of its size and position in the food chain.
If you’re ordering hamachi at a sushi bar, you’re almost certainly eating farmed Japanese yellowtail, the lowest-mercury option of the group. If you’re buying wild yellowtail steaks at a fish market, mercury content will be somewhat higher.
How Yellowtail Compares to Other Fish
Without an FDA-listed figure for yellowtail, comparing it to fish with known mercury concentrations gives the clearest picture. Fresh or frozen salmon averages just 0.022 ppm of mercury, making it one of the cleanest options available. Skipjack tuna (the kind in most canned light tuna) averages 0.144 ppm. Albacore tuna, whether canned or fresh, comes in around 0.350 ppm, putting it in the high-mercury category.
Based on independent analyses and its biological profile, farmed yellowtail (hamachi) generally falls in the range of 0.1 to 0.2 ppm, comparable to skipjack tuna and well below albacore. Wild-caught yellowtail and amberjack can range higher, potentially reaching 0.2 to 0.4 ppm depending on the size and age of the fish. For context, the FDA’s action level for mercury in fish is 1.0 ppm, and high-mercury species like swordfish, shark, and king mackerel typically range from 0.7 to over 1.0 ppm. Yellowtail sits far below that threshold.
Factors That Affect Mercury Levels
Three things drive how much mercury ends up in any given piece of yellowtail: age, size, and diet. Mercury bioaccumulates, meaning it builds up in tissue over an animal’s lifetime and increases as you move up the food chain. A two-year-old farmed hamachi eating controlled feed will carry a fraction of the mercury found in a six-year-old wild amberjack that has spent years eating smaller fish in open ocean.
Farmed fish in general tend to have more predictable and often lower mercury levels than their wild counterparts. The controlled diet and shorter lifespan of farmed hamachi work in its favor. Wild yellowtail, on the other hand, varies by geography and individual. A small wild yellowtail caught inshore will differ from a large one caught offshore, and regional pollution levels play a role as well.
How Often You Can Safely Eat Yellowtail
For most adults, eating yellowtail two to three times per week is reasonable, especially if it’s farmed hamachi. That frequency aligns with the FDA’s general guidance for fish in the low-to-moderate mercury range. If you’re eating a mix of seafood throughout the week, balancing yellowtail with very low-mercury options like salmon, shrimp, or tilapia helps keep your total mercury exposure well within safe limits.
Pregnant or breastfeeding women and young children are more vulnerable to mercury’s effects on neurological development, so the calculus changes. The FDA recommends these groups eat two to three servings of fish per week from the “Best Choices” category (the lowest-mercury tier). Since yellowtail isn’t officially categorized, a cautious approach would be to treat farmed hamachi similarly to skipjack tuna, a moderate-mercury fish suitable in limited amounts, perhaps one to two servings per week as part of a varied seafood diet. Wild-caught yellowtail or amberjack warrants more caution, with less frequent consumption.
Reducing Mercury Exposure From Yellowtail
If you eat yellowtail regularly and want to minimize your mercury intake, a few practical choices make a difference. Choose farmed hamachi over wild amberjack when possible. At sushi restaurants, hamachi is almost always farm-raised, so this is the default for most people. When buying whole fish or fillets, smaller specimens carry less mercury than larger ones. Mixing yellowtail into a rotation with low-mercury fish like salmon, sardines, or pollock spreads out your exposure rather than concentrating it.
Mercury accumulates in muscle tissue and cannot be removed by cooking, trimming, or any preparation method. The only way to control your intake is through the species and quantity you choose. That said, the health benefits of eating fish, including omega-3 fatty acids, high-quality protein, and vitamin D, outweigh the mercury risk for most people at normal consumption levels. Avoiding fish entirely to dodge mercury often means missing out on nutrients that are hard to replace from other foods.