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Related Experiment Video

Updated: Apr 21, 2026

Integrating Visual Psychophysical Assays within a Y-Maze to Isolate the Role that Visual Features Play in Navigational Decisions
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Something worth remembering: visual discrimination in sharks.

Theodora Fuss1, Vera Schluessel

  • 1Institute of Zoology, Rheinische Friedrich-Wilhelms-University Bonn, Meckenheimer Allee 169, 53115, Bonn, Germany, thfuss@uni-bonn.de.

Animal Cognition
|November 1, 2014
PubMed
Summary

Juvenile gray bamboo sharks demonstrate remarkable long-term memory, retaining learned visual information for up to 50 weeks without reinforcement. This indicates significant cognitive abilities in these aquatic animals.

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Area of Science:

  • Marine Biology
  • Animal Cognition
  • Neuroscience

Background:

  • Memory retention varies across species and tasks in vertebrates.
  • Understanding memory in elasmobranchs provides insights into cognitive evolution.
  • Sharks play crucial ecological roles where memory is essential for survival.

Purpose of the Study:

  • To investigate the long-term memory retention capabilities of juvenile gray bamboo sharks (Chiloscyllium griseum).
  • To assess the duration of memory for visual discrimination tasks in sharks.
  • To explore the adaptive significance of long-term memory in shark behavior.

Main Methods:

  • Utilized two-alternative forced-choice experiments to test memory recall.
  • Sharks were previously trained on visual discrimination tasks (shapes, lines, optical illusions).
  • Memory retention was assessed over an extended period (up to 50 weeks) without reinforcement.

Main Results:

  • Juvenile gray bamboo sharks retained learned visual information for up to 50 weeks.
  • Memory retention persisted even in the absence of ongoing reinforcement.
  • Intraspecific differences in memory retention were observed, reflecting behavioral diversity.

Conclusions:

  • Sharks possess robust long-term memory capabilities for specific cognitive skills.
  • This long-term memory likely supports critical survival behaviors like foraging and predator avoidance.
  • The findings highlight the complex cognitive abilities of sharks and their adaptive significance.