OPERATING THE HATCHERY 



FiorRE 14. — Removing the fish from a seine in such a way as to avoid the roily water 

 close to the shore of a shallow pond. (Photograph courtesy of the Minnesota 

 Department of Conservation. ) 



ber of minnows will have been cap- 

 tured. 



The minnows should be removed 

 from the trap as soon as the food 

 is gone, as experience has proved 

 that the mimiows will soon escape. 

 On one stream in Michigan, four 

 glass traps took a total of 600 min- 

 nows, 21/2 to 51/2 inches long, in 1 

 hour. The number of minnows 

 captured per trap per set ranged 

 from 10 to 70. The average dura- 

 tion of a set (established by food 

 depletion) was about 20 minutes. 



Wire traps. — Wire traps are most 

 efficient when set in quiet waters 

 iuul attended daily. They are 



baited with bread or cracker crumbs 

 and placed on the bottom of a 

 stream or pond or suspended above 

 the bottom at a desired depth by a 

 stake. The traps should be at- 

 tended daily and all fish removed 

 on each visit. If the minnows are 

 allowed to remain in the trap for 

 any extended period, many become 

 injured by continued contact with 

 the sides of the screen. In a pond 

 or lake where a good population of 

 minnows is known to exist, one \yire 

 trap, 2 feet long by 16 inches square 

 and containing a funnel at each 

 end, wnll take as many as 500 min- 

 nows in 1 day's operation. 



32 



