Bass: the same word for unrelated fish

Explainer · Last reviewed 2026-08-15

Bass names at least four unrelated groups of fish on three continents, and the word carries no taxonomic meaning at all — which matters because advice written for one is regularly read by somebody holding another.

There is no such thing as a bass. The word is a common name applied independently in several places to fish that are not closely related, and the groups it covers do not share a family, an order or a habitat.

EUROPEAN SEA BASS (Dicentrarchus labrax) is a marine and estuarine predator of the eastern Atlantic and Mediterranean, in the family Moronidae. A British or Irish angler saying bass means this and nothing else.

BLACK BASS (Micropterus) — largemouth, smallmouth, spotted and a growing list of others — are North American freshwater sunfish, family Centrarchidae. An American angler saying bass usually means one of these. They are more closely related to bluegill than to anything European.

TEMPERATE BASSES (Morone) — striped bass, white bass, white perch — are a third group again, North American and partly anadromous, in the same family as European sea bass but a different genus.

SEA BASSES more broadly, including the black sea bass of the western Atlantic, are groupers in the family Serranidae, and are not related to any of the above.

Australia adds Australian bass (Percalates novemaculeata), and Asia adds barramundi, marketed internationally as Asian sea bass, which is a Latidae and not a bass in any sense at all.

The consequence is practical rather than pedantic. A rig, a bait, a season and a set of regulations written for one of these is wrong for the others, and the word gives a reader no warning that they have crossed between them.

Why the same name landed on unrelated fish

Common names travel with people rather than with taxonomy. European settlers in North America named unfamiliar fish after the ones they knew at home, and a deep-bodied spiny-finned predator taken from a river looked enough like a bass to be called one.

The same process produced perch, trout, salmon, cod and snapper applied on several continents to unrelated animals. It is not sloppiness; it is what happens when a vocabulary is older than the classification.

Marketing later added a layer. Fish sold under a familiar name sells better than fish sold under an unfamiliar one, which is how barramundi became Asian sea bass and Patagonian toothfish became Chilean sea bass. Those names are commercial rather than descriptive, and the second is a particularly clear case: the fish is not a bass and does not come from Chile in any meaningful sense.

What to do about it when reading

The reliable move is to find the binomial. Every species record on FishingHQ carries one, and two pages naming Dicentrarchus labrax and Micropterus salmoides are about fish that share a word and nothing else.

Where a binomial is not given, geography usually resolves it. Bass in a British sea-fishing context is Dicentrarchus; bass in a North American freshwater context is Micropterus; bass on an Australian river is Percalates.

And where regulation is involved the distinction stops being academic. Minimum sizes, closed seasons and bag limits attach to species rather than to words, and reading advice written for the wrong bass is how somebody ends up out of compliance while believing they have checked.

Where to go next

Fish this applies to

What these connections rest on (4)

Scientific evidence — 4 connections

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

European sea bass
A reader arriving at this record from American writing has the wrong fish in mind.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Family and genus placement for the unrelated fish that carry the common name bass, establishing that the name has no taxonomic content.States this directlyPassage read and verified
Largemouth bass
The commonest single case of the collision, in both directions.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Family and genus placement for the unrelated fish that carry the common name bass, establishing that the name has no taxonomic content.States this directlyPassage read and verified
Smallmouth bass
Three genera share the word inside North America alone.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Family and genus placement for the unrelated fish that carry the common name bass, establishing that the name has no taxonomic content.States this directlyPassage read and verified
Striped bass
The case that shows the word cuts across families rather than along them.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Family and genus placement for the unrelated fish that carry the common name bass, establishing that the name has no taxonomic content.States this directlyPassage read and verified

Where it matters

Lure fishingThe discipline where the confusion actually costs something. A reader following American lure-fishing material for 'bass' is reading about a freshwater centrarchid and applying it to a European marine perciform, and almost none of the tackle, location or seasonal logic transfers.

What these connections rest on (1)

Scientific evidence — 1 connection

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

Lure fishing
A method or discipline joined to the mechanism that changes how it is conducted. Written where the method's own practice differs because of the mechanism — a different bait, a different season, a different handling routine, a decision not to eat something — and refused where the mechanism is merely true of the fish being caught.
- Freshwater Fishes of the British Isles — HarperCollins (New Naturalist 75), 1992 (Reference work)Relied on for: Life history, physiological tolerance, seasonal behaviour and feeding biology of European freshwater fishes.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded environment, temperature and oxygen tolerance, feeding biology and distribution of the species named.States this directlyPassage read and verified

Sources for this page

FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Family placement and distribution for Dicentrarchus labrax, Micropterus salmoides, Morone saxatilis, Centropristis striata, Percalates novemaculeata and Lates calcarifer.States this directlyPassage read and verified

How FishingHQ labels evidence is explained in the evidence policy.

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