Chemical composition and physicochemical properties of tropical red seaweed, Gracilaria changii.

•Gracilaria changii contains high nutritional values especially dietary fibre.•Its amino acid scores were comparable to FAO/WHO requirement.•This seaweed has low ω6/ω3 ratio, atherogenic and thrombogenic index.•The physiochemical properties were found to be fibre rich products.•This seaweed can be used to improve the nutritional values of foods.