Discrimination using the Color Variation of Chela in the Mud Crab Genus Scylla in Japan

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  • 日本のノコギリガザミ属３種における鉗脚の色彩変異による判別
  • ニホン ノ ノコギリガザミゾク 3シュ ニ オケル ケンキャク ノ シキサイ ヘンイ ニ ヨル ハンベツ

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Description

To classify species of the mud crab genus Scylla for stock managements, color variations among species were observed using a simple digital imaging analysis. Using digital images obtained from 42 crabs, we sampled original color specification (sRGB) values of 4 lines on a chela of each crab. These data were translated into L* a* b* color specification values by the color matching functions. The characters of L*, a* and b* values were different among three species in several observed regions. In particular, a* values of Scylla olivacea on Line 1 and 2 were almost higher than the other 2 species, and b* values of Scylla serrata on Line 1 and 2 were lower than the others. Principal component and discriminant analyses also demonstrated apparent color differentiation among three species. Therefore, we can distinguish three species by these features of color specification.

Journal

  • Aquaculture Science

    Aquaculture Science 55 (2), 265-269, 2007

    Japanese Society for Aquaculture Science

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