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  • Title: Long-wave sensitivity in the masked greenling (Hexagrammos octogrammus), a shallow-water marine fish.
    Author: Kondrashev SL.
    Journal: Vision Res; 2008 Sep; 48(21):2269-74. PubMed ID: 18675840.
    Abstract:
    Microspectrophotometry (MSP) revealed that surprisingly for a "fully marine" species, in summer, photoreceptors of the nearshore scorpaeniform fish known as the masked greenling, Hexagrammos octogrammus, contained exclusively, or presumably, porphyropsin with a small admixture of rhodopsin. As a result of this, the lambda(max) of the spectral sensitivity of the photoreceptors were significantly shifted to longer wavelengths as compared to the lambda(max) typical of marine shallow-water fishes, showing about 530 nm for rods and single cones, and 570/625 nm for double-cone members. These unique spectral shifts would permit a cone-driven wavelength discrimination in spite of high-density orange corneal filters which block light at lower wavelengths.
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