However, during the course of our work to determine optimal concentrations of pigment in feeds to achieve good colouration, we have measured total astaxanthin content (expressed on a weight basis of the abdominal muscle and abdominal exoskeleton) in a large number of prawns and observed that the amount did not relate well with visual appearance. This was further demonstrated by measuring the content of astaxanthin in prawns that had been subjectively visually graded into various categories using a colour grading chart. Mean grading scores of prawns ranged from 6 to 11. The relationship between grade score and total astaxanthin content is shown in Fig. 2. It can be seen that colour grading score, or visual appearance, is not
tightly related to measured astaxanthin content. For example, at a grade score of 9, astaxanthin content ranged from 5 to 25 μg/g prawn tail. Therefore, there must be some other explanation for the discrepancy observed.
However, during the course of our work to determine optimal concentrations of pigment in feeds to achieve good colouration, we have measured total astaxanthin content (expressed on a weight basis of the abdominal muscle and abdominal exoskeleton) in a large number of prawns and observed that the amount did not relate well with visual appearance. This was further demonstrated by measuring the content of astaxanthin in prawns that had been subjectively visually graded into various categories using a colour grading chart. Mean grading scores of prawns ranged from 6 to 11. The relationship between grade score and total astaxanthin content is shown in Fig. 2. It can be seen that colour grading score, or visual appearance, is nottightly related to measured astaxanthin content. For example, at a grade score of 9, astaxanthin content ranged from 5 to 25 μg/g prawn tail. Therefore, there must be some other explanation for the discrepancy observed.
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