Scientific name Girella nigricans
Descriptor Ayres
Year of description 1860
IUCN category LC
Family Girellidae
Genus Girella
Girella nigricans Girella nigricans


Girella nigricans, commonly known as rudderfish, is a salt water fish from the Océan Pacifique Nord Est Tempere Chaud.

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Who is it?


  • Average size
    30 cm
  • Maximum size
    50 cm
  • Average size
    30 cm
  • Maximum size
    50 cm

How to recognize the rudderfish ?

The rudderfish measures between 30 and 50 cm. This fish is bicolore with a predominantly argent and beige body.

Behaviour & Life cycle

  • diet
    omnivorous with alguivorous tendency
  • Sociability
  • territorial
  • Way of living

The rudderfish is a fish gregarious naturally found at mid-depth. This species is omnivorous with alguivorous tendency .

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


  • Reproduction
    ovipare qui pond en eau libre
  • Migratory species

The rudderfish is a fish ovipare qui pond en eau libre.

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
    15 - 24 °C
  • Depth
    2 - 30 m

Biotope presentation

The rudderfish is most often found at a depth between 2m and 30m. However, it is not impossible to find this species at other depths.

Species of the same biotope

To go further

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.

Benoit Chartrer

Benoit Chartrer


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

Age and Growth of Two Herbivorous, Kelp Forest Fishes, the Opaleye (Girella nigricans) and Halfmoon (Medialuna californiensis) - Jessica J. Bredvik - Christiana Boerger - Larry G. Allen - Southern California Academy of Sciences - 2011.

Geographic Variation in the Diet of Opaleye (Girella nigricans) with Respect to Temperature and Habitat - Michael D. Behrens - Kevin D. Lafferty - PLOS One - 2012. 7(9): e45901. doi:10.1371/journal.pone.0045901

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Where to see this species?

Species of the same biotope

Scientific partners

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