72 



PISH AND GAME COMMISSION. 



fishing grounds adjacent to ports by fishing farther banks than the 

 smaller boats can. 



As the fisheries of San Diego and San Pedro expand, that expansion 

 must take place largely in Mexico. The purse seine boats are of 

 advantage in this distant fishing. During the past sardine season, as 

 already described under the title of "Sardines," these boats were a 

 great boon to the sardine canners of San Pedro in bringing sardines 

 from a distance when they were scarce near at hand. If the four-inch 

 mesh bill for purse seines had become a law at the last legislative ses- 

 sion, the sardine season would have been a disastrous one for the San 

 Pedro canners. 



INVESTIGATIONS. 



The work on king salmon has been continued under the direction of 

 Professor J. 0. Snyder of Stanford University. Efforts to secure 

 marked fish have continued with some success. The first experiments 



Fig. 13. Seining salmon for marked fish at the mouth of the Klamath River. 

 A study of returned marked fish has greatly increased knowledge relative 

 to the age, rate of growth and migrations of the king salmon. Photograph 

 by Mrs. Ruth K. Roberts. 



in marking troll caught salmon were undertaken in order to definitely 

 determine the native stream of the salmon found in the ocean along 

 the north coast. Briefly summarized, the investigation has shown : 



Pond bred king salmon return from the ocean to the stream in 

 which they were reared. 



Salmon return to the stream in which they were reared rather 

 than to that of their real parentage. 



In seeking the parent stream on their return migration, they 

 may pass the mouths of other rivers in which the same species 

 is native. 



The nuptial migrations of individuals with the same stream 

 history, but of different age groups, are very regular in time. 



Artificially propagated king salmon appear to reach about the 

 same age and stature, and to attain about the same yearly growth 

 as others. 



