SALMON AND TROUT TN ALASKA. 



25 



possibility of fishiiig out a given stream, and with this is carried the 

 impHcation that at least the greater part of the supply of any stream 

 must be derived from the fry produced in that stream. 



CATCH OF YOUNG SALMON IN THE TRAP. 



To determme facts regarding the migration of the young salmon 

 into salt water, a trap such as is described on page 21 was placed 

 below Hirsch Rapids on the Naha, at station 2 (see map, p. 112), The 

 location was chosen on account of its accessibility, as stated above. 

 The catch made by this apparatus is shown in the following table 

 (no. 1). As the trap was operated in salt water, the catches included 

 sticklebacks, perch, blennies, occasional trout, etc., which are grouped 

 under ''Other fishes." 



Table 1. — Catch made by Trap at Station 2, Naha Bay, 1903 and 1904. 



a Several. 



6 Few. 



c Not fry hut parrs, average 50 mm. 



