Bull., U. S. B. F., 1928. (Doc. 1047.) 



Experiment 4 



Fig. 28.— Marked at Bonneville hatchery during September, 1916, when appro.ximatelv 12 months old. Recovered at 

 Astoria. Oreg., May 18, 1920, in its fifth year. Female, either 16 or 21 pounds in weight. This scale was taken from 

 the skin attached to the scar of the dorsal fin, which accounts for its small size. This is the most confusing scale in 

 the entire collection from marked Chinook salmon. In the absence of knowledge of the early history of the fish the 

 check marked 2 might have been mistaken for the first winter check. X 13 



Fig. 29. — Nuclear region of scale shown in Figure 26. X 25 



Fig. 30.— Marked at Bonneville hatchery during September, 1916, when approximately 12 months old. Recovered near 

 Altoona, Wash., June .5, 1920, in its fifth year. Female, 32 inches long and weighing 21 pounds, showing nucleus 

 lacking incidental check and having only two or three rings of intermediate growth. X 25 



Fig. 31.— Marked at Bonneville liatchery during September, 1916. when approximately 12 months old. Recovered at 

 Ilwaco, Wash.. May 17, 1920. in its fifth year. Female, 35.4 inches long- and weighing 21.5 pounds, showing a 

 very poorly differeiitiateil nucleus. X 25 



