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The Journal of Experimental Biology 206, 1643-1648 (2003)
doi: 10.1242/jeb.00337

Rearing in different photic and spectral environments changes the optomotor response to chromatic stimuli in the cichlid fish Aequidens pulcher

Ronald H. H. Kröger^1,2,*, Bettina Knoblauch¹ and Hans-Joachim Wagner¹

¹ Eberhard-Karls University Tübingen, Institute of Anatomy, Österbergstrasse 3, 72074 Tübingen, Germany
² Lund University, Department of Cell and Organism Biology, Vision Group, Zoology Building, Helgonavägen 3, 22362 Lund, Sweden

^* Author for correspondence (e-mail: ronald.kroger{at}cob.lu.se)

Accepted 26 February 2003

Developmental plasticity of spectral processing in vertebrates was investigated in fish by using an innate behavior, the optomotor response. Rearing blue acara (Aequidens pulcher; Cichlidae) under white lights of different intensities as well as deprivation of long wavelengths induced significant changes in the animals' responses to chromatic stimuli. Deprivation of short wavelengths had no effect. With this and previous studies on animals reared under similar conditions, we have demonstrated that developmental plasticity in spectral processing is present at a wide range of neural levels, spanning from photoreceptors to behavior. We hypothesize that earlier studies did not reveal such effects because of the rearing and testing conditions used.

Key words: color vision, spectral processing, developmental plasticity, vertebrate, cichlid fish, Aequidens pulcher

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