40 



THE MIGRATION AND CONSERVATION OF SALMON 



Fig. 6. Distant recaptures of salmon liberated as kelts in the Annapolis Eiver, Nova Scotia. 



Local recaptures were all in the river. All recaptures of salmon liberated as kelts outside 



THE mouth of the St. John Eiver across the Bay of Fundy were local. 



turbulent current. Flowing water with 

 fine turbulences, that result from contact 

 of the water with solid bodies, causes the 

 salmon to orient itself against the direction 

 of flow. With the strength of the current 

 varying sufficiently from place to place, the 

 salmon will come to rest in relation to the 

 bottom where the strength of the current 

 matches its activity. Tidal currents will 

 not lead it very far, and, as the tide 

 changes, the direction will be reversed. 

 Currents issuing from rivers will lead it 

 riverward. These features suffice to ex- 

 plain the behavior of salmon on the Mar- 

 garee coast. They are taken first in the 

 spring where the sea water has the best 



chance to become warm, the place where 

 the water issuing from the extensive, shal- 

 low, Cheticamp harbor during falling tide 

 collects with little dissipation by mixing, 

 that is toward the mouth of the Cheticamp 

 River (see Fig. 3). They tend to collect 

 along the course taken by the water issuing 

 from the Margaree River. They become 

 concentrated near shore with onshore 

 winds. Wherever they may be tagged and 

 liberated, they go in every possible direc- 

 tion. They tend to collect inside project- 

 ing points of land, such as Cheticamp and 

 Enragee points, where tidal currents do 

 not run very strongly. Strong flow from 

 the Margaree River leads them riverward. 



