Life in the flow: Unique adaptations for feeding on drifting zooplankton in garden eels

Alexandra Khrizman, Gal Ribak, Dmitri Churilov, Irena Kolesnikov, Amatzia Genin

Research output: Contribution to journalArticlepeer-review

Abstract

A major challenge faced by sessile animals that feed in the flow is to maintain effective feeding postures while enduring hydrodynamic forces. Garden eels exhibit an exceptional lifestyle: feeding on drifting zooplankton while being 'anchored' in a burrow they dig in the sand. Using underwater observations, sampling and three-dimensional video recording, we measured the feeding rates and characterized feeding postures of garden eels under a wide range of current speeds. We show that the eels behaviorally resolve the trade-off between adverse biomechanical forces and beneficial fluxes of food by modulating their body postures according to current speeds. In doing so, the eels substantially reduce drag forces when currents are strong, yet keep their head well above bottom in order to effectively feed under conditions of high prey fluxes. These abilities have allowed garden eels to become one of the rare oceanic fishes that live in sandy, predation-rich habitats and feed on zooplankton while being attached to the bottom.

Original languageEnglish
Article numberjeb179523
JournalJournal of Experimental Biology
Volume221
Issue number16
DOIs
StatePublished - Aug 2018

Keywords

  • Biomechanics
  • Drag force
  • Fish
  • Gorgasia sillneri
  • Zooplanktivory

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