Ecological Studies on the Feeding of Fishes-V

Size of Fish and Satiation Amount

Abstract

The satiation amount is standardized by the method described in the previous reports^{1 ?? 4)} and the relationship between body weight and satiation amount is examined. The results obtained are summarized as follows:
As the body weight increases the satiation amount increases proportionately (Fig. 1 A). However, with increase in the body weight, the “satiation ratio” (satiation amount/body weight) declines (Fig. 2 A). Further, the stomach weight is proportionate to the body weight and the ratio (stomach weight/body weight) declines as the body weight increases (Fig. 1 B and 2 B). This phenomenon is due to the fact that the lighter fishes have a larger (stomach weight/body weight) ratio. In short, smaller fishes have larger stomachs for their size and thus a larger satiation ratio.