THE ANIMAL FILES

European perch

Perca fluviatilis

Striped sides, a changing menu and a ribbon of eggs.

European perch show dark vertical bars and reddish fins, but their ecology is not fixed by that familiar outline. Young fish and adults use different foods, females place egg ribbons on underwater structures, and the perch itself feeds larger predators. One species occupies several positions in a freshwater community.[1]

Follow the evidence ↓
European perch
Image: George Chernilevsky · Commons · Public domain
Side pattern
Dark vertical bars[1]
Eggs
A pale ribbon attached to underwater structures[1]
Predators
Fish-eating birds, pike and otters[1]

Different food at different sizes

Juveniles take small invertebrates and planktonic food, while larger individuals can consume fish as well as invertebrates. The transition means that body size changes more than the amount of food required. It can alter which resources are accessible and how the animal connects to other members of the food web.[1]

A ribbon rather than scattered eggs

During spawning, females produce a pale ribbon deposited on aquatic plants or submerged branches. The physical form and placement distinguish this from simply releasing unrelated single eggs.[1]

The hunter is also food

Perch are eaten by birds such as ospreys and cormorants, as well as other fish and mammals including pike and otters. Calling the perch carnivorous identifies what it eats, not an escape from predation. Food-web descriptions work best when they follow both outgoing and incoming feeding relationships.[1]

A COMMON MIX-UP

Does being a fish predator put it beyond other predators?

No. Several birds, fish and mammals consume perch. Predator and prey are relationship roles, not mutually exclusive categories.[1]

TRY A LITTLE REASONING

Why might removing submerged branches affect more than swimming space?

Reveal the explanation

Egg ribbons can be placed on those structures. A change in physical structure can therefore change reproductive sites as well as open-water access.[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 — Perca fluviatilis (adapted and translated; exact revision)
  2. NCBI Taxonomy — Perca fluviatilis (identity and game lineage)

Last fact check:

One discovery leads to another

Yellow perchA striped fish changes its menu as it grows.Perca flavescens ↗Allmouth goosefishThe fishing rod is part of the fish.Lophius piscatorius ↗GuppyColour can attract a mate and catch a predator’s eye.Poecilia reticulata ↗