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Effects of sandy substrate and light on hypermelanosis of the blind side in cultured Japanese flounder Paralichthys olivaceus

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Abstract

Rearing experiments were carried out to clarify the effects of sandy substrate and light irradiation on hypermelanosis of the blind side (the staining type of ambicoloration) in cultured Japanese flounder. Fish were reared in three experimental conditions: (1) no sandy substrate into which fish could bury themselves and with upward light irradiating their blind sides, (2) no sandy substrate and no upward light, and (3) sandy substrate (transparent glass sand) with upward light irradiation. Pigmented areas on the blind side were measured by an image analyzing system. Flounder from the third condition (sandy substrate with light irradiation) showed the lowest pigmentation on the blind side. In contrast, fish from the second condition (no sandy substrate and no light irradiation), showed the highest pigmentation coverage. These results indicate that sandy substrate on the bottom in culture tanks is more important than light irradiation as a factor affecting hypermelanosis of the blind side in cultured Japanese flounder.

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Authors and Affiliations

  1. Central Research Institute of Electric Power Industry, Abiko, Chiba, 270–11, Japan

    Nakahiro Iwata & Kotaro Kikuchi

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  1. Nakahiro Iwata
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  2. Kotaro Kikuchi
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Iwata, N., Kikuchi, K. Effects of sandy substrate and light on hypermelanosis of the blind side in cultured Japanese flounder Paralichthys olivaceus. Environmental Biology of Fishes 52, 291–297 (1998). https://doi.org/10.1023/A:1007493913799

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  • DOI: https://doi.org/10.1023/A:1007493913799

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