Yellow Tainting of Flesh in Pangasius (Pangasianodon hypophthalmus): Origin of the Color and Procedures for Removal

Authors : Seikh ISLAM, Mohammad HAQUE, Muhammad RAZZAK, Louise SCHLÜTER, Emranul AHSAN, Raju PODDUTURİ, Niels JORGENSEN

Pages : 193-201

View : 13 | Download : 9

Publication Date : 2021-10-01

Article Type : Research Paper

Abstract :Pangasius insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(lutein, zeaxanthin and β-carotene; 18.8 mg/kg); as compared to the experimental feeds insert ignore into journalissuearticles values(≤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.
Keywords : Pangasius, yellow flesh, water quality, feed composition, maize, carotenoids