# A Walter Sisulu University-led study has discovered that adding green Rooibos extract to tilapia feed significantly improves fish growth rates and feed efficiency. The trial compared commercial fish feed against feed enhanced with either fermented Rooibos, the familiar red variety, or unfermented green Rooibos extract. Leader of the study, professor Grace Okuthe, says the results showed that tilapia fed green Rooibos grew about 2.83-percent faster and converted feed into body mass 0.9-percent more efficiently than the control group:
Study shows adding green Rooibos extract to tilapia feed significantly improves fish growth rates [SOUND]
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