Beef is the headliner of the carnivore diet, but it doesn’t have to play every show. Seafood is animal food, it fits the rules, and it brings a few things your ribeye can’t. Variety, for one. And a break from chewing, for another.
Here’s how to work fish and shellfish into a carnivore plan without turning dinner into a sad, dry fillet situation.
Why Seafood Belongs on a Carnivore Plate
If your diet is built on animal foods, fish qualifies. Salmon, sardines, shrimp, oysters and cod are all animal-sourced, carb-free (give or take a trace in some shellfish), and packed with protein.
Some people go beef-only. That’s a stricter version, and a perfectly valid personal choice. But for most people following a broader carnivore approach, seafood is a welcome addition. It also solves a practical problem: eating the same thing for 90 straight days is a great way to learn how much you can resent a cow.
Fatty fish are also a natural source of omega-3 fats, which beef contains in much smaller amounts. If you’re eating mostly grain-fed beef, a few fish meals a week round things out nicely. (If you’re curious about the beef side of that equation, we’ve covered grass-fed versus grain-fed separately.)
Fatty Fish: The Easy Winners
If you want fish that behaves like a carnivore food, start with the fatty ones. They bring their own fat, so you don’t need to engineer the meal.
- Salmon: The gateway fish. Rich, forgiving, and hard to ruin. Skin-on and pan-seared is the move, and crispy skin is basically bacon from the sea.
- Mackerel: Strong flavor, high fat, and usually affordable. It’s like salmon’s louder cousin.
- Sardines and herring: Small, oily, and unapologetically fishy. More on these in a moment.
- Trout: Milder than salmon, and good if you’re easing in.
Cooking is simple. Salt generously, sear in butter, tallow or whatever fat you like (we have a whole post on cooking fats), and pull it off the heat when it just flakes. Overcooked salmon is the culinary equivalent of a wet sock.
Lean Fish and Shellfish: Delicious, but Add Fat
Cod, haddock, tilapia, halibut, shrimp, scallops and crab are all fine carnivore foods. They’re also lean, which means a plate of them can be mostly protein with very little fat to go with it.
That matters because most people on carnivore rely on fat for energy and fullness. A bowl of plain shrimp may leave you hungry again in an hour, and you’ll start eyeing the cupboards with suspicious intent.
The fix is easy: bring the fat yourself.
- Cook shrimp or scallops in plenty of butter or ghee.
- Pan-fry white fish in tallow or bacon fat.
- Serve crab or lobster with melted butter, and don’t be shy.
- Pair a lean fish meal with a fattier side, like a couple of egg yolks or some crispy bacon.
Think of lean seafood as a delivery system for butter. Nobody has ever complained about that job description.
Oysters, mussels and clams deserve a mention too. They’re a treat, they’re rich in minerals like zinc, and they work well alongside a steak. Just know that some shellfish contain small amounts of carbohydrate, so strict zero-carb folks may want to keep portions reasonable.
Canned Fish: The Pantry Hero
Canned fish is the most underrated tool in the carnivore kitchen. It’s cheap, shelf-stable, requires no cooking, and travels well. That makes it ideal for desk lunches, road trips and the nights when you’ve forgotten to defrost anything.
Good options include:
- Sardines: Packed in water or olive oil. Check labels, because some come in flavored sauces with added ingredients you may not want.
- Canned salmon: Often includes soft, edible bones, which are a natural source of calcium.
- Mackerel and herring: Same story. Look for simple ingredients: fish, salt, water or oil.
- Tuna: Convenient, but lean, so add some fat. Mayo-free tuna with butter melted over it is more appealing than it sounds.
Always read the label. You want the ingredient list to be short and boring. If it reads like a chemistry exam, put it back.
How Often to Eat It, and What to Watch For
There’s no official carnivore schedule for seafood. Many people eat fish a couple of times a week and keep red meat as the base, while others eat it daily. Do what suits your budget, your taste and how you feel.
A few sensible notes:
- Mix it up. Rotating between different fish and shellfish keeps your nutrient intake varied, and keeps you from getting bored.
- Mind the mercury. Larger, longer-lived predatory fish tend to carry more of it than smaller ones like sardines. Government food-safety agencies publish guidance on which fish to limit, especially for pregnant women and young children, so check what your local authority recommends.
- Watch the extras. Breaded fish, sauces, glazes and “seasoned” frozen fillets often sneak in starches and sugars. Plain is your friend.
- Choose sources you trust. Fresh, frozen and canned can all work. Frozen fish is often perfectly good and easier on the wallet.
If you have a shellfish allergy or any health condition that affects what you should eat, talk to your doctor before changing your diet. Your plan should work for your body, not just your Instagram feed.
Fitting Fish Into Your Numbers
Here’s where seafood gets tricky: different fish have very different fat-to-protein ratios. A salmon fillet and a cod fillet of the same weight will land very differently on your daily totals, and so will a tin of sardines versus a tin of tuna.
If you’re tracking, the free Carnivore Macro Calculator helps you set daily protein and fat targets, so you can see whether a lean seafood dinner needs extra butter to keep you on course. It takes the guesswork out of “is this enough fat?” and saves you from the unscientific method of just feeling vaguely peckish at 9 p.m.
The Bottom Line
Seafood is a smart, tasty way to add variety to a carnivore diet. Lean on fatty fish like salmon and mackerel for easy wins, add butter or tallow to lean fish and shellfish, and keep a few tins of sardines in the cupboard for emergencies. Skip the breading, read the labels, and cook it gently.
Your steak will understand. It’s secure enough to share the spotlight.