Pangasius (Pangasianodon hypophthalmus) is a commonly farmed fish in ponds in Bangladesh but its yellow flesh color creates a barrier for export. Here, we investigated if feed ingredients and environmental parameters might impact yellow tainting of the flesh. In experimental feeds, maize (a typical ingredient in commercial feeds) was replaced by soybean meal, and frequent exchange of pond water was introduced. Chemical analyses showed that the commercial feed was high in carotenoids (lutein, zeaxanthin and β-carotene; 18.8 mg/kg) as compared to the experimental feeds (≤1 mg carotenoids/kg). After feeding the fish commercial and experimental feeds for 9 months, the content of total carotenoids in the flesh was reduced by 48% to 64% and visual yellowness by up to 47% by the experimental feeds. Weekly or biweekly water exchange in combination with the experimental feeds further reduced the yellow coloration to 22% relative to fish given commercial feed and without water exchange. Our study demonstrates that pangasius with white flesh can be produced in Bangladesh by combining feeds low in pigments with frequent water exchange.
This study project was funded by DANIDA (Denmark’s development cooperation, Ministry of Foreign Affairs of Denmark) to the project “Upgrading pangas and tilapia value-chain in Bangladesh”
Project Number F387-A26778
The authors would like to express sincere appreciation to Department of Plant and Environmental Sciences, University of Copenhagen; Department of Aquaculture, Patuakhali Science and Technology University; and Department of Aquaculture, Bangladesh Agricultural University for adequate field and laboratory facilities to complete this research successfully.
Project Number F387-A26778
Primary Language | English |
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Subjects | Hydrobiology |
Journal Section | Research Articles |
Authors | |
Project Number | Project Number F387-A26778 |
Publication Date | October 1, 2021 |
Submission Date | January 16, 2021 |
Published in Issue | Year 2021 Volume: 36 Issue: 4 |
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