Investigations were made on cuttle-fish (Ommastrephes sloani paci ficus) caught from July to December, 1951.
As to the weight ratio of each part to whole body, there were no remarkable change except the viscera which increased gradually toward the main fishing season. Of the chemical variations, a remarkable change was shown in the oil content of liver, which had a maximum content in October and November, contrasting with minimum contents of moisture and nitrogen in these periods.