23 26 28 29 29 30 I 2 2 7 9 10 15 16 17 18 18 20 20 21 22 23 24 27 27 28 29 29 30 3 3 

 June July Aug. 



Figure 3. Recoveries of pink salmon tagged in the Alaska Peninsula area during 1958 



site have been combined. (Experiments carried 

 out at traps located in the Shumagin Islands and 

 at Swedania Point have been considered as one 

 site and are termed Shumagin experiments.) 



Segregation of local runs-Figures 5 and 6 

 illustrate the dispersion of fish tagged at sites in 

 Morzhovoi Bay, Pavlof Bay, and the Shumagins . 

 They show there is little intermingling between 

 pink salmon of the eastern and western sections 

 of the coast. 



Pink salmon tagged in Morzhovoi Bay re- 

 mained almost exclusively in waters at the south - 

 westernpart of the Peninsula. Eighty-six percent 

 of the recaptures were from this section--Cold 

 Bay, Morzhovoi Bay, and Ikatan Bay. Only 4 

 percent of the returns were from areas east of 

 Cold Bay. No salmon tagged at Morzhovoi Bay 

 were recaptured east of the Shumagin Islands 

 (figure 5). On the other hand, pink salmon that 

 were tagged in the Shumagins showed a wide range 

 inmovement, both in easterly and westerly direc- 

 tions. The movement to areas west of Pavlof 

 Bay was minor and decreased as the season pro- 

 gressed. Tag recoveries in this section of the 

 coast from the Shumagin experiments were as 

 follows: July 1 to 9, 13 percent; July 24 to 28, 

 5 percent, and July 23 to August 3, percent. 

 Even more significant is the fact that recoveries 

 from areas on the mainland east of the Shumagin 

 Islands were almost entirely from Shumagin ex- 

 periments. This indicates that runs in the west- 

 ern and eastern section of the coast are indepen- 

 dent. 



The Pavlof and Shumagin experiments il- 

 lustrate further segregation. The Shumagin traps 

 are located in outside waters, at outer points, 

 capes and headlands. The wide range of recov- 

 eries from tagging at these sites indicates that 

 the gear deployed in these localities intercepts 

 runs composed of a mixture of races. A similar 

 pattern of dispersion was observed for all ex- 

 periments carried out at the other outer points- 

 East Anchor Cove, Bold Cape, Belkofski Point, 

 and Moss Cape. In contrast, the distribution of 

 fish tagged in bays was limited, indicating sepa- 

 ration into distinct populations. 



Tagging experiments performed in Ivanof 

 and Orzenoi Bays also demonstrate this clearly. 

 Two experiments were carried out in Ivanof Bay; 

 95 pink salmon were tagged on July 18 and 257 on 

 July 20. Returns from both experiments were 

 extremely high, 67 and 58 percent, respectively, 

 but not one recapture was reported from outside 

 Ivanof Bay. Later in the season, on August 1, 

 399 pink salmon were tagged in Orzenoi Bay. 

 Only 8 of these fish were recaptured in the com- 

 mercial fishery . They were in the bay or adjacent 

 waters. However, 173 of the tagged fish were 

 found in the stream that enters Orzenoi Bay. 



Segregation into distinct units in the bays 

 is a natural function of time--as the season pro- 

 gresses and the fish approach sexual maturity, 

 they seek out their natal streams — so these re- 

 sults are to be expected. The significant point 

 demonstrated by these experiments is that there 

 is apparently little tendency on the part of the fish 

 to leave once they have entered a bay. This is in 

 contradiction to the results of the Morzhovoi Bay 



