300 Lake Maxinkuckee, Physical and Biological Survey 



24. Yellow Perch. Perca flavescens. 



One hundred and fifty of these perch were examined at differ- 

 ent times, and in their stomachs were found insect larvae, amphi- 

 pods, small fish, mollusk remains, crawfish, and in the smaller speci- 

 mens, plankton and a few algae. 



Ergasilus centrarchidarum was found on the gill-filaments of 

 nearly every fish, but although careful search was made not a single 

 specimen of Achtheres was secured. 



A large species of cestode was found in the throat of many 

 specimens whither it seemed to have crawled from the stomach 

 after the fish's death. Large leeches were also found in the mouth 

 of 50 of the fish; trematodes and Acanthocephali were found in 

 the stomach and intestine of about one-third of the specimens. Of 

 two examined October 27, 1904, one contained a rather large rock 

 crawfish, and the other a number of Sphseriums. 



One found dead on shore November 1, 1904, contained a large 

 dragon-fly larva. 



On October 3, 1904, many perch were caught fishing from the 

 pier. They all contained medium sized crawfishes. Of two perch 

 about six inches long examined October 22, 1904, one contained 8 

 small Physa and the other a well digested fish. Of a number of 

 small perch caught off the Gravelpit September 25, 1900, three 

 contained crawfishes, one had 28 small Physas, five others had a 

 few Physas each, and one had two Vivipara opercula. 



25. Manitou Darter, Per dim caprodes zebra. 



The largest and one of the most common darters in the lake. 

 Eight specimens from two and a half to three and three-quarters 

 inches in length were examined. They all contained much indis- 

 tinguishable insect remains ; in four, may-fly larvae could be recog- 

 nized, in two others beach fleas, and in one Bosmina, Daphnia and 

 Chironomus larvae. 



26. Johnny Darter. Boleosoma nigrum. 



Another very common species found everywhere in shallow 

 water. Of the five specimens examined, two yielded beach fleas, 

 two Chironomus larvae, and one an ant-like insect which could not 

 be determined. In addition they all contained partly digested in- 

 sect remains, and one had a trematode parasite in its stomach. 



27. Iowa Darter. Etheostoma iowse,. 



Fairly common along shore in the shallow water where it lurks 

 amid the algae on the bottom. Of the three specimens examined 

 each contained several beach fleas and a mass of indistinguishable 

 insect remains. 



