Is Fish Meat? Biology Says Yes, Lent Says No, Here's Why

Striped bass portions vacuum-packed on a counter: long skin-on fillets showing the dark stripes, a pale pink skinless fillet, two small cheeks and a seasoned piece of belly — Photo: H. Alexander Talbot, via Wikimedia Commons (CC BY 2.0)

Fish is meat in the plain sense, because a fillet is an animal’s muscle. But Catholic Lent rules and US food law both count it as something else. Neither side is wrong. They’re using one word for two different things. So your answer depends on who’s asking.

US food law says meat comes from “cattle, sheep, swine, or goats” and leaves fish out. Then the Federal Meat Inspection Act covers one group of fish anyway: catfish.

Is fish considered meat? Here’s who says what

Find the row that fits you. That’s your answer, and you can skip the rest.

Who’s asking	Is fish meat?	What that rests on
A biologist	Yes	A fillet is the muscle of an animal with a backbone
A dictionary	Yes, with a catch	Wiktionary: the “flesh” of an animal used as food, “often understood to exclude fish and other seafood”
US food law	No	9 CFR 301.2 names cattle, sheep, swine and goats, and treats horses the same way
World Health Organization	Not red meat	Red meat is “all mammalian muscle meat”
Catholic Church in Lent	No	US bishops: “Fish are a different category of animal”
Orthodox Church in Great Lent	Off the menu, like meat, most days	One parish’s rule: fish “only on the feasts of Annunciation & Palm Sunday”
Jewish kosher law	No	My Jewish Learning: fish is “pareve, neither meat nor dairy”
Islam	Its own rule	Quran 5:96 makes seafood lawful, and fish skip ritual slaughter
Hindu practice	No single answer	Varies by region and caste
Vegetarian Society	Off the plate either way	“simply stop eating meat and fish”
Pescatarian	Yes, the only one eaten	Seafood is “the only source of meat in a diet”
Vegan	Off the plate	Excludes “meat, fish and other animal seafood”

And yes, a fish is an animal. It has muscle, blood and a skeleton, as do fish have bones shows from the inside. The argument is only ever about the word.

Why is fish not considered meat?

Blame the word. From the 700s on, “meat” meant food in general, especially solid food. The sense we use now, the flesh of a killed animal, turned up in the 1300s. Even today Wiktionary notes that sense is “often understood to exclude fish and other seafood.” Webster’s leans the same way: “the flesh of an animal (especially a mammal) as food.” The American Meat Science Association goes the other way and counts “fish/seafood” as meat.

Fish also eats differently, and that keeps the two apart in the kitchen. A fish has less of the tough connective tissue that holds a steak together. The FAO, the UN’s food agency, gives that as one reason fish is generally less tough than meat.

A fillet is a stack of muscle blocks with thin sheets of connective tissue between them, a few millimeters thick. The collagen in those sheets doesn’t hold its shape in the pan the way a mammal’s does.

A crappie from the side with four numbered cuts: 1 behind the side fin down to the backbone, 2 along the backbone to the tail, 3 stop at the tail, flip the fillet and slice off the skin, 4 the rib cage cut out with the knife tip, with the belly meat under the ribs left on

The fillet is the muscle along the fish’s side. Drawing: fishing.info

Is fish meat during Lent?

Not for Catholics. On Ash Wednesday and the Fridays of Lent, Catholics 14 and over skip meat, and fish is allowed. The US bishops spell it out: meat “comes only from animals such as chickens, cows, sheep or pigs,” all of which live on land. Birds count as meat too.

“Salt and freshwater species of fish, amphibians, reptiles, (cold-blooded animals) and shellfish are permitted,” the bishops say. So a Friday plate of walleye is fine, and so are frog legs. They do add that a “lavish buffet at your favorite seafood place sort of misses the point.”

Church law names every Friday of the year. It also lets each country’s bishops set the details or swap in another penance. So ask your own diocese about Fridays outside Lent.

Why fish and not beef? Thomas Aquinas gave a reason in the 1200s. Land animals are “more like man in body,” he wrote, so “they afford greater pleasure as food.” That’s why the Church forbade fasters “to eat flesh meat, rather than to eat fish.”

Orthodox Christians draw the line in a different place. In Great Lent, the strict rule takes fish off the table too. The Church of the Nativity in Erie, Pennsylvania, puts it plainly: “Fish is allowed only on the feasts of Annunciation & Palm Sunday.” Parishes differ, so ask yours.

Two American stories show how far this goes. Catholics Downriver from Detroit have eaten muskrat on Lenten Fridays since the 1780s. A 2002 archdiocesan document calls it “a long-standing permission.” The bishop of Lansing wrote in 1987 that the archdiocese had told him “no dispensation was ever given.” He put it down to immemorial custom instead, even though a muskrat is a warm-blooded mammal.

Then there’s the Filet-O-Fish. Lou Groen ran a McDonald’s on the west side of Cincinnati. On Lenten Fridays his Catholic customers went to a nearby Frisch’s Big Boy for a fish sandwich. So he built his own. On Good Friday 1962, he sold 350 of them at 25 cents each.

Is fish red meat, white meat or poultry?

Fish isn’t red meat and it isn’t poultry, so you can cross both off. The World Health Organization defines red meat as “all mammalian muscle meat,” and a fish isn’t a mammal. US rules define poultry as “any domesticated bird.”

White meat is the loose one. “White fish” is a real term for lean fish, such as cod and haddock. They carry only “a small strip of dark, or red, muscle just under the skin,” the FAO says. Fatty fish have much more of that dark muscle.

Fish muscle usually runs 15 to 20 percent protein, per the FAO. Fat is the big difference. It’s usually under 1 percent in the cod family. In fatty fish it swings with the season. A starved herring may have as little as 0.5 percent. One that’s been feeding heavily can top 20.

Why does the US inspect catfish under its meat law?

This is the odd one, and it comes straight from Congress. The legal definition of meat doesn’t mention fish. But the Federal Meat Inspection Act lists “all fish of the order Siluriformes” among the species it covers, and that order is the catfish.

Channel catfish painted by Duane Raver: the deeply forked tail, wedge-shaped head and scattered spots

Channel catfish. Illustration: Duane Raver, U.S. Fish and Wildlife Service (public domain)

Farm bills in 2008 and 2014 made that change, and the inspection rule took effect March 1, 2016. Catfish moved to the USDA, while the FDA kept every other fish. So a channel catfish on a processing line is handled under a meat law, even though the law’s own definition of meat leaves it out.

Does the Bible say fish is meat?

It treats fish as flesh, but as its own kind. The line is 1 Corinthians 15:39 in the King James Version. “All flesh is not the same flesh: but there is one kind of flesh of men, another flesh of beasts, another of fishes, and another of birds.” Leviticus 11:9–12 is where the fins-and-scales rule below comes from.

Is fish kosher?

Only if it has fins and scales. That’s the Torah’s own test, and it means the scales must be visible and easy to remove. Fish is pareve, meaning neither meat nor dairy, so it needs no separate dishes. It needs no ritual slaughter either. Chabad says that “as soon as a fish is removed from the water it is considered slaughtered.”

Orthodox practice keeps fish and meat apart in cooking and serving. Conservative sources have dropped that rule, per My Jewish Learning.

Here’s how the fish you’re likely to catch stack up on two well-known lists.

Fish	Kosher?	Who lists it
Bass	Yes	Chabad, My Jewish Learning
Trout	Yes	Chabad, My Jewish Learning
Salmon	Yes	Chabad, My Jewish Learning
Walleye	Yes	My Jewish Learning, in the perch group
Perch	Yes	Chabad, My Jewish Learning
Bluegill	Yes	My Jewish Learning
Pike	Yes	Chabad, My Jewish Learning
Carp	Yes	Chabad
Crappie	Not on either list	Ask before you serve it
Catfish	No	Chabad
Eel	No	Chabad
Sturgeon	Disputed	Chabad says no, the Conservative movement says yes
Swordfish	Disputed	Chabad says no, the Conservative movement says yes
Shrimp, crab, lobster	No	Chabad

Is fish halal?

Yes. Islam treats it under its own rule, so the question there isn’t whether fish is meat. It’s whether it’s lawful. Quran 5:96 says, in Mustafa Khattab’s translation: “It is lawful for you to hunt and eat seafood.” Fish also skips the slaughter that land animals need. “The jurists mention that fish can be eaten without slaughtering,” writes Abdullah James Clarke in The Halal Life.

The schools of Islamic law differ on the rest of the sea. The Hanafi school reads the verse as “fish only,” so its rulings leave out lobster and oysters. Its scholars don’t agree on whether prawns and shrimp count as fish. The Shafi’i and Hanbali schools allow everything that lives in the sea, and the Maliki school does too, except eel. Cooking for a Muslim friend? Ask what they follow.

Do Hindus eat fish?

Many do. Hinduism has no single food rule, and practice shifts with region and caste. In Pew’s 2021 survey of India, 44 percent of Hindus called themselves vegetarian, and Pew left the word’s meaning up to each person. That figure runs from 71 percent in the North to 18 percent in the East. Pew’s report on it doesn’t mention fish.

Fish and seafood are a staple across eastern and coastal southwestern India. Many Brahmins avoid fish, with “significant exceptions, especially in Bengal, Kashmir, and some other parts of north India.”

Do vegetarians eat fish?

No. The Vegetarian Society’s definition is one line: “simply stop eating meat and fish.” Vegans skip fish too, along with eggs, dairy and honey. Someone who eats fish but no other meat is a pescatarian, a diet where seafood is “the only source of meat.”

Whether that counts as vegetarian is still argued. The Pescetarian Society calls it “a form of vegetarianism.” The Vegetarian Society’s definition rules it out. For some people the question is whether a fish suffers, which is what do fish feel pain gets into.

Is seafood meat? What about shrimp?

Shrimp splits the rule books harder than fish does. Catholic Lent allows shellfish. Kosher law doesn’t. Islamic schools are divided. Vegetarians skip it. Cut one open and you’ll find animal muscle, same as a fillet.

What does this mean for the fish in your cooler?

A keeper, a fish that’s legal to keep, is fine on a Friday in Lent. Check the size and limit rules first, same as any other day.

Cooking for friends? Ask before you serve. Don’t assume fish is safe for a vegetarian, and don’t guess at kosher or halal. For fish from a store without kosher supervision, Chabad says you need to see “the scales on the fish, or at least the indentations in the skin.” So keep the fish whole until you’ve asked, and put the fillet knife away for now.

Then there’s the part that matters for your health. The Dietary Guidelines for Americans recommend “At least 8 ounces of seafood (less for children) per week based on a 2,000 calorie diet.” Fish that family or friends caught gets its own FDA rule. “Check for fish and shellfish advisories to tell you how often you can safely eat those fish.” And the line worth repeating at the water: “If there is no advisory, eat only one serving and no other fish that week.”

Which fish are worth keeping is its own question. Is bass good to eat? and are northern pike good to eat? start there, and more odd questions like this one are in fish facts.

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