Abstract
In the tagging experiment for salmon in the North Pacific, the body length of tagged salmon are being measured both at the time of its tagging and recovery. Then the differences between these body lengths are considered to be the growth in the period of their migration. Assuming that the growth of salmon in the period be expressed as lt=leKt, the value of K (instantaneous growth rate) could be estimated by this formula. (lt; Body length at the time of recovery, l; Body length at the time of tagging, t; Period by number of day). The data used here are the results of tagging experiments carried out in the waters of Aleutian Is. from 1956 to 1958 by U.S. And the calculated growth rate are shown in Table 1. and Figure 1. In this table it is noticiable that 1) the value of K of mature salmon is larger than that of immature, and 2) the K of pink salmon is larger than those of red salmon and chum salmon.
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