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 231 



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 community 242 



The vegetation community 242 



The deep-water community 245 



Relation of Douglas Lake species to those of other waters 246 



Summary 247 



Literature cited 249 



217 



