CatchRules

Bass Identification

Black bass and temperate bass are separate families with separate limits. Upload a photo, or use the jaw-line and tooth-patch checks below.

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What bass covers

"Bass" covers two unrelated families. The black bass — largemouth, smallmouth, spotted — are oversized sunfish in the genus Micropterus, and they are told apart by the jaw line. The temperate bass — striped, white, and their hybrid — belong to Morone and are told apart by stripes and tongue tooth patches. Working out which family you are holding first cuts the possibilities in half.

How to identify bass

Work through these in order. Each step narrows the shortlist, so the later ones are only needed when the earlier ones leave more than one candidate.

  1. Decide which family it is. A long body with a single horizontal band or blotchy lateral line means black bass. A deep, silvery, herring-shaped body with several clean horizontal stripes means temperate bass. The two families share almost no field marks, so this call comes first.
  2. For black bass, line the jaw up with the eye. Close the mouth and look at the rear edge of the upper jaw. Past the back of the eye means largemouth. Level with or in front of the pupil means smallmouth or spotted bass.
  3. Separate smallmouth from spotted. Smallmouth show vertical bars and no rows of spots below the lateral line. Spotted bass show a broken horizontal blotch plus distinct rows of small dark spots underneath it, and a rough tooth patch on the tongue.
  4. For temperate bass, count tongue tooth patches. Run a thumb over the tongue. One patch means white bass, two parallel patches mean striped bass, and two patches that are smudged together mean the hybrid. Then check the stripes: unbroken to the tail on a striper, broken and fainter on a white bass.

Commonly confused species

These are the pairs anglers mix up most often, and each one turns on a single reliable mark.

Largemouth vs Smallmouth Bass

Largemouth have an upper jaw extending past the rear of the eye and a broken horizontal stripe. Smallmouth have a jaw ending under the eye, a bronze cast, and vertical bars.

Largemouth vs Spotted Bass

Spotted bass have a rough tooth patch on the tongue, a jaw that stops under the eye, and rows of dark spots forming lines below the lateral line. Largemouth have no tongue patch.

Striped Bass vs White Bass

Striped bass are elongated with unbroken stripes and two distinct tooth patches on the tongue. White bass are deep-bodied and compressed with faint, broken stripes and a single tooth patch.

Hybrid Striped Bass vs Striped Bass

Hybrids are deeper-bodied than a pure striper with stripes that are distinctly broken and offset, and they rarely exceed the length a striper of the same weight would reach.

Where identification goes wrong

Knowing where the marks stop working is most of knowing when to trust them.

  • Spotted bass are frequently logged as smallmouth in the parts of the Ohio and Tennessee valleys where the two overlap. The tongue tooth patch is the reliable separator, not colour.
  • Florida-strain and northern largemouth are the same species and cannot be separated by eye in a photograph, regardless of what the fish measures.
  • Juvenile largemouth carry a strong lateral band that fades with age, so a big largemouth can look far less marked than a small one.

Frequently asked questions

How do you tell a largemouth from a smallmouth bass?

Look at where the upper jaw ends relative to the eye. On a largemouth bass the jaw extends past the rear edge of the eye; on a smallmouth it stops beneath the eye. Smallmouth also show vertical bars rather than a horizontal band, and are usually bronze rather than green.

Is a striped bass the same as a largemouth bass?

No. Striped bass belong to the temperate bass family Morone and are a deep-bodied, silvery fish with clean horizontal stripes. Largemouth bass are black bass in the genus Micropterus and are closer relatives of sunfish than of striped bass.

What is a hybrid striped bass?

A hybrid striped bass, often called a wiper, is a cross between a striped bass and a white bass, widely stocked in reservoirs. It shows broken stripes like a white bass on a heavier body, and two tongue tooth patches that run together rather than staying separate.

Bass in the reference (15)

Every species here has a profile with its range, IUCN status, and identification notes.

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