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Hydrobiologia

, Volume 663, Issue 1, pp 109–119 | Cite as

First feeding diet of young brown trout fry in a temperate area: disentangling constraints and food selection

  • Javier Sánchez-HernándezEmail author
  • Rufino Vieira-Lanero
  • María J. Servia
  • Fernando Cobo
Primary research paper

Abstract

Diet composition of newly emerged brown trout fry in natural areas remains poorly known, and foraging abilities at this early stage, although presumably reduced, are still under discussion. We have studied gut content composition of brown trout fry in a temperate area (Galicia, NW Spain) and compared it to the benthic macroinvertebrate community. Small prey such as chironomid larvae and baetid nymphs were the most important food items for newborns, some of them still presenting yolk remnants. However, the positive selection observed for Polycentropodidae and Simuliidae and the rejection of Elmidae and Leuctricidae suggest that other factors apart from size, such as locomotor abilities of fish or accessibility and antipredator behaviour of prey play an important role in feeding behaviour. Additionally, analysis of diet changes on the studied fry suggests a dramatic shift in niche breadth at the moment of complete yolk absorption, which might be related to the improvement of swimming and handling ability of fry for capturing and ingesting prey. The presence of aerial imagoes only in the stomachs of fry with no yolk provides further support to this hypothesis. Planning of restoration works on spawning grounds should then allow enough time for complete recolonization by benthic macroinvertebrates, including first instars, as searching for food in newborns is limited to the nest area due to mobility constraints.

Keywords

Brown trout Fry First feeding Diet Yolk resorption Foraging abilities 

Notes

Acknowledgments

Part of this work has been carried out in the laboratories of the Station of Hydrobiology of USC “Encoro do Con” in Vilagarcía de Arousa. This work has been partially supported by the project INCITE09203072PR of the Xunta de Galicia. The authors are also grateful to two anonymous referees for their helpful comments.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Javier Sánchez-Hernández
    • 1
    • 2
    Email author
  • Rufino Vieira-Lanero
    • 2
  • María J. Servia
    • 3
  • Fernando Cobo
    • 1
    • 2
  1. 1.Departamento de Zoología y Antropología FísicaUniversidad de Santiago de CompostelaSantiago de CompostelaSpain
  2. 2.Estación de Hidrobiología “Encoro do Con”Vilagarcía de Arousa, PontevedraSpain
  3. 3.Departamento de Biología Animal, Biología Vegetal y Ecología, Facultad de CienciasUniversidad de A CoruñaA CoruñaSpain

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