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Effects of dietary astaxanthin level on carapace color of juvenile Portunus trituberculatus. The color of diet (A), from left to right with 0, 24.2, 45.8, 72.4, 94.2 and 195.0 mg/kg astaxanthin, the scale is 1:10; (B): from left to right, crabs were fed diets with 0, 24.2, 45.8, 72.4, 94.2 and 195.0 mg/kg astaxanthin, the scale is 1:5.
