32 



V. S. BUREAU OF FISHERIES 

 METHODS AND MATERIALS 



The specimens were caught by Dr. E. P. Churchill during the 

 sunimer of 1926 while engaged with W. H. Over in making a bio- 

 logical surve}^ of the lakes mentioned in this paper. Three methods 



1 LAKE ANOZS 

 Z. LAKE tlADlSOH 



3. LAKE POIHSETT 



4. LAKi KAMPE2>KA 

 S.LAKL COTTOnwOOD 

 4 UKL BYRON 



7 SAND LAKE 

 8. CLEAR LAKE 



?. NORTH RED IRON LAKE 

 10. LAKE TETON KAH/\ 



II. LAKE OAKWOOD 



Fig. 2.— Eastern South Dakota 



were employed in securing them — the hook and line, the seine, and 

 the minnow net for fingerlings. Immediately after the adult fish 

 were taken from the water they were identified, opened, and the 

 alimentary tract carefully removed with scissors and placed in a 

 10 per cent solution of formaldehyde to check the process of digestion 



