FISH FAUNA OF DOUGLAS LAKE REGION. 33 



the same sort of conditions. These stream l)e(ls are gravel or clear 

 sand, and if a mucky l)ottom exists at all, it is near the banks or in holes 

 and bayous along the stream. Tn these places the Uuibra limi and small 

 AmieuDis melas are abundant. Aside from these situations, however, 

 Maple River and the small clear streams afford a group of species 

 different from those found in any other habitat of the region. The 

 brook trout, Salvelinus Jontinalis, is abundant along the small inlets 

 and in Maple River five miles doAvn stream from the lake. Besides 

 Salvelinus fontinalis, several other species, which did not occur in the 

 other habitats, were found in Maple River in al)undance. Etheodoma 

 iowae, Notropis lohipplii, Semotilus atromaculatus, and Rhinichthys 

 atronasus were taken in numbers. Cottus icfalops is also more al)undant 

 in Maple River than in Bessey Creek. 



From the foregoing studies of the several habitats the hsh fauna of 

 Douglas Lake and connecting streams ma}' be seen to include the 

 following 26 species, of which 23 (marked *) occur in the lake proper: 



TABLE NO. 8. 



1. Bowfin, Amia calva* 



2. Coiiiiiioii sucker, Catostomus commersonii.* 

 .3. Catfish, A mieurus melas.* 



4. Hudson River shiner, Notropis hudsonius* 



5. Common shiner, Notropis cornutus.* 



6. Cayuga shiner, Notropis cayuqa.* 



7. Bhie shiner, Notropis whipplii. 



8. Horned dace, Semotilus atromaculatus. 



9. Blaclv-nosed dace, Rhinichthys atronasus. 



10. Blunt-nosed minnow, Pimephales notatus.* 



11. Picl<erel-pike, Ksox lucius.* 



12. Mud minnow, Umbra limi.* 



13. Brook trout, Salvelinus fontinalis.* 



14. Lake whitefish, Aruyrosomus artedi cisco.* 

 1.5. Trout perch, Pcrcopsis yuttatus.* 



16. Log perch, Percina caprodes.* 



17. Iowa darter, Etheostoma iowae.* 



18. .Johnny darter, Boleosoma nigrum.* 



19. Yellow perch, Perca flarescens.* 



20. liock bass, Amhloplites rupestris.* 



21. Large-mouthed black bass, Micropterus snlmoides.* 



22. Small-mouthed black bass, Micropterus dolomieu.* 



23. Pumpkin seed, Eupomotis gibbosus.* 



24. Blue gill, Lepomis pallidus.* 



25. Ling, Lota maculosa.* 



26. Sculpin, Cottus ictalops.* 



With this determination of the fish fauna of the Douglas Lake Region 

 and the general distribution of the species in mind, the study of the 

 mortality of the species was begun. To this end one mile of beach was 

 laid off along the east side of South Fishtail Bay (See map, Fig. 2). 

 This section of beach was chosen because it receives the full sweep of 

 the wind from across the entire lake, hence most floating fish, even on 

 the far side of the lake, are eventually beached someAvhere Avithin this 

 mile. This strij) of beach was gone over each evening and all of the 

 beached fish coUectetl, identified, measured, examined, and buried. 

 The study of the beached fish was continued for a period of 40 con- 

 secutive days (July 10 to August 19, 1913), and was supj^lemented ])y 

 a study of the beached fish on all shores of the lake. The following 

 table gives the results of the 40 days collecting on the mile of beach: 



5 



