FlOLKE 'Si 



-Adult lipeiiiug and spawning (foreground) ponds to which adult sulmc 

 are diverted from the river in background. 



temperatures in excess of 60° for ex- 

 tended periods. It is believed that an 

 increase in the rate of interchange of 

 the water in a holding area can be sub- 

 stituted for low water temperatures to 

 inhibit disease development." 



The retention of adult fall chi- 

 nook salmon until ripe for spawning- 

 is not so difficult as the retention of 

 springs. The former fish usually 

 are almost ready for spawning when 

 trapped and need to be held in the 

 ])onds for only a few days. These 

 fish, also, are not so aggressive and 

 can be retained more easily in the 

 ponds. For these reasons it is not 

 necessary to prepare such elaborate 

 holding ponds. This is true of chum 

 salmon, also. An adequate supply 

 of aerated water is the principal 

 requirement. 



Personnel, Equipment, and 

 Facilities 



The number of persons required 

 to staff a hatchery during the entire 



year depends upon the type of oper- 

 ation, including species propagated, 

 climatic conditions, and the location 

 of the unit. In general, the normal 

 hatchery may be permanently 

 staffed with 1 man for each 10,000 

 pounds of salmon produced. This 

 rule has been applied to Fish and 

 Wildlife Service units on the Co- 

 lumbia River. The production fig- 

 ure per man is higher than is usually 

 attained at present. Additional 

 help required can be recruited lo- 

 cally when needed. 



The salmon hatchery is equipped 

 with sufficient trucks to facilitate 

 operations and with a shop in which 

 repairs can be made to such equip- 

 ment as traj'S, nets, and racks. Ma- 

 jor vehicle repairs are most fre- 

 quently made in a commercial shop 

 unless a number of hatcheries in an 

 area can profitably maintain a cen- 

 tral repair shop with a mechanic in 

 charge. 



53 



