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Spectral sensitivity of the cod gadus morhua


, : Spectral sensitivity of the cod gadus morhua. Marine Behaviour & Physiology 10(2): 145-166

The spectral sensitivity of the cod was determined under both dark adapted and light adapted conditions in the laboratory. Cod were trained by cardiac conditioning to detect a difference in radiance between an image of spots and the background radiance of a screen. Thresholds for this response were measured for a range of different wavelengths, and expressed as quantum adjusted values. Electroretinographic [ERG] studies were also performed on the eyes of cod, and spectral sensitivity curves prepared. Under dark adapted conditions both the behavioral and ERG derived curves showed greatest sensitivity in the blue/green at 490 nm, matching the absorption curve for rhodopsin. A secondary peak in the behaviorally derived curve in the green/yellow at 550 nm indicated that a population of yellow cones may be implicated with the rods in scotopic vision. Under light adapted conditions the behavioral curves showed a shift to the blue, perhaps indicating an adaption to the high red content of the illuminating source. The ERG curve showed greatest sensitivity to blue/green, as in the scotopic experiments but with an enhanced response at 550 nm, indicating greater cone activity. There may be a complex interaction between rods and cones in the cod retina, both types of receptor being active over a wide range of light intensities.

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