CONTENTS. 



Page, 



Introduction 219 



Fish habitats of the lake 221 



Barren sand-shoal habitat 221 



. Barren stony-shoal habitat 221 



The vegetation habitat 221 



The deep-water habitat 222 



The fishes 222 



Lake herring, or cisco 223 



Common sucker 223 



Food 223 



Blunt-nosed minnow 225 



Homed dace , or creek chub 226 



Cayuga minnow 227 



Spot-tailed minnow 227 



Common shiner 227 



Common bullhead 228 



Mud minnow 228 



Common pike or pickerel 228 



Trout perch 23 1 



Rock bass 231 



Bluegill ! 232 



Pumpkinseed 233 



Small-mouthed black bass 234 



Large-mouthed black bass 235 



Yellow perch 235 



Log perch 238 



Johnny darter , 239 



Etheostoma iowae 239 



Miller's thumb 239 



Burbot 239 



Fish communities of Douglas Lake 239 



The community of young fishes 240 



The stony-shoal commimity 242 



The vegetation community 242 



The deep-water community 245 



Relation of Douglas Lake species to those of other waters 246 



Summary 247 



Literatiu'e cited .' 249 



217 



