FISH FAUNA OF DOUGLAS LAKE REGION. 



29 



It will !)(> seen from Table No. 2 that all Eupomotis gihbosus and 

 Lepomis pallidus were inside the enclosed area and were caught going 

 out. Catosiomus commersonii, however, were taken on both sides of 

 the net and near the bottom where they feed. The frequency of this 

 particular species all over the lake, except in very deep water, is prac- 

 tically the same, and as expected it occurs in l)oth shallow and deep 

 water. Esox lucius, however, belongs in a different habitat in deeper 

 water. Since none were taken in either the fyke net or on the inside 

 of the gill net, it is quite evident they visit the habitat for feeding. The 

 nets were emptied every morning and evening, and about as many of 

 the various species were taken at one time as another, except Esox 

 lucius, which in every instance was gilled at night during the usual 

 time of feeding. 



The coml)ined frequency of all species collected in this habitat, in- 

 cluding visitors, as show^n by the combined collections, is as follows: 



TABLE NO. 3. 



Species. 



1. Pumpkin seed, Etipomotis gibbosus 



2. Blue gill, Lepomis pallidus 



3. Sucker, Catosiomus com.mersonii . . . 



4. Catfish, Ameiurus melas 



5. Trout perch, Percopsis guttatus . . . . 



6. Yellow perch, Perca ftavescens 



7. Pickerel-pike, Esox lucius 



8. Bowfin, Amia calva 



The south bay of North Fishtail Bay presents a situation more 

 nearly like that of the lake proper. It gets about the same amount of 

 wind and wave action; its bottom is sandy and drops abruptly from a 

 narrow, shallow shoal to a depth of 40 feet. It has, however, along the 

 edge of the step-off and in the shallows of the south side, where the 

 wind and waves have less sweep, a considerable patch of yellow water 

 lilies, Nymphaea americana and Potomogeton. The fyke net was 

 placed in this situation for a period of ten days with the open mouth 

 of the trap toward the shore. The catch, therefore, while it represents 

 the relative frequency of the species in the habitat, was not large. The 

 result of the collections is as follows: 



TABLE NO. 4. 



Species. 



1. Pumpkin seed, Eupomotis g'bhosus 



2. Large-mouthed black bass, Microplerus sahnoides 



3. Small-mouthed black bass, Micropterus dolomieu. 



4. Sucker, Catostom.us commersonii 



.5. Catfish, Am/ietirus melas • 



6. Blue gill, Lepomis pallidus. .• 



7. Rock bass, Amblopliles rupestris 



8. Yellow perch, Perca flavescens 



Number. 



Average size. 



148 m.m. 

 173 m.m. 

 210 m.m. 

 332 m.m. 

 200 m.m. 

 116 m.m. 

 131 m.m. 

 145 m.m. 



Frequency. 



.217 

 .131 

 .043 

 .173 

 .087 

 .131 

 .131 

 .087 



