Ontogenetic shift in spectral sensitivity of Pacific snapper Chrysophrys auratus
نویسندگان
چکیده
Electroretinogram (ERG) experiments on the sparid fish Chrysophrys auratus (Forster 1801) demonstrated an ontogenetic shift in spectral sensitivity, from long wavelengths (yellow-orange) in small (60 g) fish, to shorter wavelengths (blue) in larger (800 g) fish. Changes in spectral sensitivity are consistent with the life history of the species, since juveniles migrate from predominantly long wavelength estuarine nursery habitats to more open coastal waters, in which shorter wavelengths dominate. These results strengthen conclusions from earlier studies on C. auratus, in which spectral sensitivity of the optomotor response was tested, and confirms the value of combining physiological and behavioural measures of visual function in fish.
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