Several common fish are low enough in purines to fit comfortably into a gout-friendly diet. Tilapia, catfish, sole, pollock, and halibut all fall on the lower end of the purine spectrum, while options like salmon and canned tuna land in the moderate range. The key is knowing which species to reach for, which to limit, and how preparation can shift the numbers in your favor.
Why Purines in Fish Matter
Purines are natural compounds found in many foods. Your body breaks them down into uric acid, and when uric acid builds up in the bloodstream, it can crystallize in joints and trigger gout flares. Fish is one of the trickiest food groups to navigate because purine levels vary dramatically from one species to the next. Some fish contain fewer than 70 mg of purines per 100 g of meat, while others pack well over 200 mg in the same serving.
That range means “eat less seafood” is too blunt to be useful. The better approach is choosing the right fish and keeping portions in check, generally around 4 to 6 ounces per day.
Fish With the Lowest Purine Levels
The fish consistently cited as low in purines are mild-flavored white fish and a few freshwater species:
- Tilapia: Low in purines and high in protein, making it one of the most gout-friendly options available.
- Catfish: Another low-purine freshwater fish that’s also a good source of vitamins and minerals.
- Sole: A lean flatfish with a low purine load.
- Pollock: Widely available (it’s the fish in most fish sticks and imitation crab), and low in purines.
- Halibut: A firmer white fish that stays on the lower end of the scale.
These fish share a common trait: they’re lean, mild, and have relatively little of the compounds that drive uric acid production. If you’re building a regular fish rotation, these are your safest starting points.
Moderate-Purine Fish You Can Still Enjoy
Salmon is probably the most popular fish that falls into the moderate category. Wild Alaskan salmon contains roughly 63 to 67 mg of purines per serving by some estimates, though other measurements place salmon varieties higher, around 119 to 177 mg per 100 g depending on the species and how purine content is measured. The variation comes from differences between wild and farmed fish, the specific cut, and the testing method used. For most people managing gout, salmon in reasonable portions a few times a week is workable.
Canned tuna is another moderate option worth knowing about. Fresh tuna contains about 157 mg of purines per 100 g, but canned tuna drops to roughly 117 mg per 100 g. The canning process, which involves cooking the fish and draining liquid, likely accounts for some of that reduction. If you eat tuna regularly, choosing canned over fresh sashimi-grade tuna gives you a meaningful purine advantage.
High-Purine Fish to Limit or Avoid
Some seafood sits firmly in the high-purine category and is worth limiting if you’re prone to gout flares. The Mayo Clinic specifically flags anchovies, sardines, and codfish as higher-purine options among finfish. Shellfish as a group also tends to run higher.
Sardines are a common culprit because people eat them whole, including the organs and skin, which concentrate purines. Anchovies pose the same problem: they’re small, eaten whole, and packed with purines relative to their size. These aren’t foods you need to eliminate entirely if you love them, but they’re the ones most likely to push your uric acid levels up when eaten frequently or in large amounts.
How Cooking Method Changes Purine Content
One of the most practical things you can do is boil or poach your fish instead of frying or baking it. Research on marine fish found that boiling significantly reduces purine content because purines dissolve out of the flesh and into the cooking liquid. In one study, the dominant purine compound in fish muscle dropped by as much as 70% in dorsal (back) meat and 53% in belly meat after boiling.
Most of that reduction happens quickly. Purine levels in belly meat fell by nearly 65% within the first three minutes of boiling. For back meat, the majority of purines transferred to the water within 12 to 15 minutes. The key is discarding the cooking liquid afterward rather than using it as a sauce or broth base, since that’s where the purines end up.
Steaming and microwaving also reduce purines to some degree, but boiling is the most effective method studied so far. One earlier study on tilapia found that boiling reduced two key purine compounds by about 46%, outperforming both steaming and microwaving. If you’re choosing between preparation methods and gout is a concern, poaching or boiling in water gives you the biggest reduction.
Portion Size and Frequency
Even low-purine fish can become a problem in large enough quantities. A reasonable daily target is 4 to 6 ounces of lean protein from fish. That’s roughly the size of one to one and a half standard fillets, depending on the species. Spreading your fish meals across the week rather than eating large portions in a single sitting also helps keep uric acid levels more stable.
Pairing fish with foods that don’t add to your purine load matters too. Vegetables, whole grains, and dairy are all low in purines or, in the case of dairy, may actually help lower uric acid. A plate of poached tilapia over rice with vegetables is a very different purine picture than a surf-and-turf platter with sardines and organ meats on the side.
Quick Reference: Fish by Purine Level
- Lower purine: Tilapia, catfish, sole, pollock, halibut
- Moderate purine: Salmon, canned tuna, fresh tuna
- Higher purine: Anchovies, sardines, codfish, shellfish
Choosing fish from the lower and moderate categories, keeping portions at 4 to 6 ounces, and boiling or poaching when possible gives you the most room to enjoy seafood without driving up uric acid.