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Related Concept Videos

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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Related Experiment Video

Updated: Jul 16, 2025

Implantation of a New Micro Acoustic Tag in Juvenile Pacific Lamprey and American Eel
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Anguillid eels.

Michael J Williamson1, Charlotte Pike2, Matthew Gollock2

  • 1Institute of Zoology, Zoological Society of London, Outer Circle, Regent's Park, London NW1 4RY, UK; Department of Genetics, Evolution and Environment, University College London, Darwin Building, 99-105 Gower Street, London WC1E 6BT, UK.

Current Biology : CB
|September 12, 2023
PubMed
Summary
This summary is machine-generated.

Anguillid eels, or freshwater eels, are vital to aquatic ecosystems but face numerous threats. Further research is crucial for understanding and conserving these unique catadromous fish.

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Area of Science:

  • Ichthyology
  • Conservation Biology
  • Ecology

Background:

  • Anguillid eels (genus Anguilla) are globally distributed, facultatively catadromous fish with complex life cycles.
  • Despite their common name, not all anguillid eels inhabit freshwater environments.
  • These eels play significant ecological and commercial roles in both marine and freshwater systems.

Purpose of the Study:

  • To highlight the limited understanding of anguillid eel biology.
  • To emphasize the ecological and economic importance of anguillid eels.
  • To underscore the threats facing anguillid eel populations and the need for conservation.

Main Methods:

  • Review of existing literature on anguillid eel life history, distribution, and ecological roles.
  • Analysis of conservation status based on the Red List of Threatened Species.
  • Identification of key stressors impacting anguillid eel populations.

Main Results:

  • There are 19 species/subspecies of Anguilla, found worldwide except in the eastern Pacific and southern Atlantic.
  • Anguillid eels are facultatively catadromous, originating in marine environments.
  • Six species are listed as Threatened, and four as Data Deficient, due to migration barriers, pollution, climate change, and overexploitation.

Conclusions:

  • Anguillid eels are ecologically and commercially valuable but face severe threats.
  • Current knowledge is insufficient for effective conservation and management.
  • Further research is essential to improve understanding and implement targeted conservation strategies for these threatened fish.