Effects of environment and carotenoid pigment on blue discoloration of pond-raised tiger prawn, Penaeus monodon Fabricius
1991
Suwanna Benjatammanont
Throughout the period of cultivation cycle, most of phytoplanktons found were cyanophyceae, especially the genus Oscillatoria. When there was less incidence of blue discoloration, planktons frequently found were diatom: Chaetoceros and Coscinodiscus. These two genera of diatom contained high amount of carotenes and xanthophylls, which directly affected blue discoloration. Blue tiger prawn contained lower amount of carotenoids when compared to normal shrimp. Water qualities affecting blue discoloration were salinity and transparency. Low salinity and high transparency caused blue discoloration. Raw feed had indirect effect on blue discoloration. Raw feed contained minerals which were necessary for the growth of planktons. When raw feed was used, the number of planktons increased, thus water transparency decreased which consequently lessened blue discoloration. Raw feed also contained high quantity of carotenoids, therefore, shrimp fed raw feed obtained higher content of carotenoid which normal shrimp had content of carotenoid more than blue shrimp. Protein, moisture, fat and ash contents of blue shrimp were in the range of 15.83-20.80, 71.22-77.46, 0.06-0.24 and 1.30-1.55 percents respectively and normal shrimp were in the range of 15.19-19.46, 70.95-80.28, 0.06-0.26 and 1.31-1.74 percents respectively. The proximate composition of both blue and normal shrimp is in the same range as value found in general shrimp.
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