

Above. The sonic tag transmits signals which 

 allow biologists to "track" a salmon during its 

 migration upstream. The behavior data col- 

 lected will be used in research on Fish passage 

 at dams. 



Above. Biologists work in the field the year 

 'round, in studies concerning survival of eggs and 

 the production of our rivers, and winter is no 

 exception. 



Left. Working from a boat, biologists use elec- 

 trofishing gear to collect specimens for laboratory 

 and field studies of competition and predation 

 among fishes. 



Right. Electricity is being applied in 

 large-scale experiments at Lake Tapps, 

 Wash., to guide fingerling salmon on their 

 downstream migration. This equipment 

 has shown favorable results. 



