Preventing discoloration and lipid oxidation in dark muscle of yellowtail by feeding an extract prepared from mushroom (Flammulina velutipes) cultured medium

From the paper

Abstract

A hydrophilic extract prepared from waste medium from mushroom (Flammulina velutipes) cultivation contained ergothioneine (ESH) at a concentration of 340mg/L (=48mg/kg of solid medium). The content of ESH in the extract at which 50% of the DPPH radical was scavenged was 0.3μg. Effects of the extract on color stability and lipid oxidation in dark muscle of yellowtail (Seriola quinqueradiata) during chilled storage for 4days were evaluated by feeding the extract to the fish as a supplement. There was no mortality during the 4-week feeding period, and the fish grew normally. Browning development in dark muscle of yellowtail fed diets containing 1% and 10% of the extract was remarkably suppressed during 4days of storage at 0-2°C. These results clearly showed that the extract is a promising source of natural antioxidants that can be used in aquaculture to improve the quality of fish meat during post-harvest storage at lower temperatures.