Chemical Studies on the Red Muscle ("Chiai") of Fishes.-III:Comparative Studies of Amino-Acid Contents in the Protein of the Ordinary and the Red Muscle of Fishes by Microbiological Assay

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By using microbiological methods, seventeen amino acids were determined in the protein prepared from four species of fish, Scomber japonicus, Seriola quinqueradiata, Parathunnussibi, and Katsuwonus vagans. The results obtained were tabulated in Table 3. Distribution of amino acids in the muscle protein of these fish seemed to be relatively uniform, irrespectively of species of fish and kind of muscle. It is noticeable that the content of amino acids in the protein of the superficial red muscle of fish, such as Parathunnus sibi and Katsuwonus vagans, which have the deep seated red mucsle too, agreed surprisingly with those of the ordinary muscle. However, between the deep seated red and the ordinary muscle of above two species, there seemed to be some differences, although very small, in content of several amino acids. This tendency was observed also, between the red and the ordinary muscle of Scomber japonicus and Seriola quinqueradiata, glycine, leucine, phenylalanine, and perhaps proline being prevailing in the red muscle, and aspartic acid, glutamic acid, histidine, lysine, and perhaps valine, serine, threonine, methionine, and tyrosine being prevailing in the ordinary muscle. From the nutritional point of view, the protein of these fish, both the red and the ordinary muscle, may be considered to be as rich as those of domestic animals in the essential amino acids.
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