ブラジル南部における黄グチの各部歩留りおよび化学組成
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概要
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Whole body of sea-trout was analysed physically and chemically and the results were subjected to the statistical analysis, in terms of sex, size, stage of maturity, season and area of catch. Fillet yield was about 45% of total weight for Santos fish, but varied seasonally ranging from 44% to 48% for Rio Grande do Sul. Oil, moisture, ash and protein contents were determined and discussed on each factor responsible for their variations. Larger fish contained equal oil in the both areas, but the smaller one from Rio Grande do Sul had three times as much oil as the Santos fish. Fishes in early stages of ripeness and less oil than those in later stages in Santos and the vice versa in Rio Grande do Sul. Overall, the Rio Grande do Sul catch was considerably oilier than the Santos catch.