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A Fish-feeding Laboratory Bioassay to Assess the Antipredatory Activity of Secondary Metabolites from the Tissues of Marine Organisms
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How to Survive a (Juvenile) Piranha Attack: An Integrative Approach to Evaluating Predator Performance.

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The armored threestripe cory catfish (Corydoras trilineatus) armor effectively protects it from juvenile red-bellied piranha (Pygocentrus nattereri) bites, with predation only successful on unarmored areas. This highlights the importance of prey defenses in predator-prey dynamics.

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Area of Science:

  • Integrative biology
  • Functional morphology
  • Predator-prey interactions

Background:

  • Evolutionary arms races drive adaptations in predator-prey relationships, particularly in aquatic ecosystems.
  • Predatory fish utilize physical attributes like teeth and powerful bites, while prey species develop defenses such as armor and spines.
  • The interaction between the armored Corydoras catfish and juvenile red-bellied piranha serves as a model for studying these adaptations.

Purpose of the Study:

  • To investigate the resistance of Corydoras trilineatus armor to piranha bite forces.
  • To determine the effectiveness of Corydoras defenses in predator-prey encounters.
  • To link predator morphology and feeding behavior to prey survival outcomes.

Main Methods:

  • Measured bite force and jaw muscle morphology of juvenile Pygocentrus nattereri.
  • Assessed the puncture resistance of Corydoras trilineatus scutes through indentation tests.
  • Observed in situ predatory interactions between piranhas and catfish.

Main Results:

  • Juvenile P. nattereri possess robust jaw muscles, delivering average bite forces of 1.03 N and maximums of 9.71 N.
  • C. trilineatus survived 37% of piranha bites, with armor withstanding an average of nine bites before puncture.
  • Predation success was limited to attacks on unarmored regions: the opercular opening and caudal peduncle.

Conclusions:

  • Juvenile P. nattereri rarely employ maximal bite force, exhibiting predation success rates comparable to adult vertebrates.
  • C. trilineatus effectively avoids predation through resilient armor and behavioral strategies that limit attacks on vulnerable areas.
  • The study demonstrates a strong link between morphology, behavior, and survival in predator-prey dynamics.