THE ANIMAL FILES

Burbot

Lota lota

Winter ice can cover a fish’s spawning season rather than end it.

Burbot are elongated, bottom-associated fish of cold waters, recognisable by a single chin barbel. They breed during winter in many populations. Early larvae drift in open water before later stages increasingly use the bottom and hunt other fish.[1]

Follow the evidence ↓
Burbot
Image: NOAA Great Lakes Environmental Research Laboratory (GLERL) · Commons · Public domain
Chin
One barbel[1]
Breeding
Winter spawning, often under ice[1]
Adult food
Primarily fish[1]

A long body near the bottom

A flattened head and single chin barbel distinguish the outline from an eel-like resemblance. Two dorsal fins are present, the second much longer than the first. Although the surface looks smooth, minute scales are present. Similarity to an eel or catfish is not an identity test.[1]

Eggs in the cold season

Spawning commonly occurs during winter, sometimes below ice. Adults release eggs and sperm into the water rather than building a guarded nest. Eggs drift and settle into spaces in the substrate. Water temperature affects development, linking timing to environmental conditions rather than one universal hatching deadline.[1]

A changing food web

Young burbot take small invertebrates, while adults feed mainly on fish. Local prey abundance matters: Lake Erie studies documented increased use of introduced round gobies after their spread. This is a concrete example of a predator’s menu changing when a new prey becomes available, not evidence that every population eats the same fish.[1]

A COMMON MIX-UP

Does a smooth-looking burbot lack scales?

No. Its scales are extremely small.[1]

TRY A LITTLE REASONING

Why could a new fish species alter burbot feeding without changing the predator’s species?

Reveal the explanation

Available prey changes, and the same predator can shift toward a newly abundant food source.[1]

Sources & editorial notes

Adapted and translated from the cited Wikipedia revisions, with source-linked reasoning. Image credit and licence are listed separately above.

Adapted and translated from Wikipedia contributors; exact revisions are linked below. CC BY-SA 4.0

  1. Wikipedia contributors — Lota lota (adapted and translated; exact revision)
  2. NCBI Taxonomy — Lota lota (identity and game lineage)

Last fact check:

One discovery leads to another

Atlantic codA shoal shares a journey, not necessarily an identical meal.Gadus morhua ↗Allmouth goosefishThe fishing rod is part of the fish.Lophius piscatorius ↗GuppyColour can attract a mate and catch a predator’s eye.Poecilia reticulata ↗