bleak

Scientific name Alburnus alburnus
Descriptor Linnaeus
Year of description 1758
IUCN category LC
Family Leuciscidae
Genus Alburnus
Alburnus alburnus Alburnus alburnus

Introduction

Alburnus alburnus, commonly known as bleak, is a fresh water fish.

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Who is it?

Morphology

  • Average size
    12 cm
  • Maximum size
    15 cm
  • Longevity
    15 year
  • Shape
    Oval
  • Average size
    12 cm
  • Maximum size
    15 cm
  • Longevity
    15 year
  • Shape
    Oval

How to recognize the bleak ?

The bleak measures between 12 and 15 cm. This fish is unicolore with a predominantly argent body.

Sexual dimorphism

The females have a more rounded abdomen than the males, they are generally stockier. This characteristic is exacerbated in the period of reproduction.

Behaviour & Life cycle

  • diet
    carnivorous
  • Sociability
    living in shoals
  • territorial
    No
  • Way of living
    diurnal

The bleak is a fish living in shoals naturally found near to the surface. This species is carnivorous .

n general, this species does not care much about other animals crossing its path.

Reproduction

  • Reproduction
    ovipare qui pond sur substrat caché

The bleak is a fish ovipare qui pond sur substrat caché.

Harmless species

This species does not represent any particular threats to humans when encountered in its natural environment.

Where to find it?

Where to see this species?

What is its habitat?

Natural environment characteristics

  • Temperature
    10 - 20 °C
  • pH (acidity)
    7 - 7.5
  • gh (hardness)
    6 - 10
  • Flow
    Slow and Stagnant

Biotope presentation

This animal evolves in areas characterized by a strong presence of vegetation (aquatic and marsh plants, decaying organic matter, roots...).

Species of the same biotope

To go further

Species of the same family

To read on the web

Sources & Contributions

Participation & Validation

The Fishipedia team and specialist contributors are committed to providing high-quality content. However, although the information comes from scientific sources or testimonials from specialists, the cards may contain inaccuracies.

Patrick Chartrer

Patrick Chartrer

Benoit Chartrer

Benoit Chartrer

Translation

Translation done with the valuable contribution of our translators, who make this information available to a wider audience. We sincerely thank them for their commitment.

Bibliographic references

Les Poissons d'eau douce de France - Eric Feunteun - Jean Allardi - Philippe Keith - Biotope Edition - 2011. Collection Inventaires & Biodiversité, publication scientifique du Muséum

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Where to see this species?

Scientific partners

Species of the same family

Species of the same biotope

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