Hypentelium nigricans--a northern species, populations of 
the northern hogsucker are found in southern I1linois only in 
Big Creek and in Big Grand Pierre Creek. 
Moxostoma duquesnei--the black redhorse is rare and spor- 
adically distributed in Illinois. Big Creek probably contains 
the only large population in {fllinois. 
Cottus carolLinae--the banded sculpin is rare and sporadically 
distributed in Illinois. A large population exists in Big Creek. 
Lampetra Lamotter--the brook lamprey is rare in Illinois 
and known from only six streams, one of which is Big Creek. 
Other crayfishes and fishes present in Big Creek are: 
Arconectes Lmmunts 
Cambarus diogenes 
ESox amertcanus, grass pickerel 
Campostoma anomakum, stonerorlér |» 
Notropis chrysocephakus, striped shiner 
Notropts umbratihis, redfin shiner 
Pimephales notatus , bluntnose minnow 
Semotilhus atromaculatus, creek chub 
Eximyzon obLongus, creek chubsucker 
Manytrema meLanops , spotted sucker 
Noturzus miurzus, brindled madtom 
Ictakurus natakis, yellow bullhead 
Fundulus olivaceus, blackspotted topminnow 
Aphredoderus Sayanus, pirate perch 
Lepomas cyanellLus, greensunfish 
Lepomis macrochinus, bluegill 
Lepomis megalotis, longear sunfish 
Micropterus punctulatus, spotted bass 
Etheostoma caerulLeum, rainbow darter 
Etheostoma nignum, johnny darter 
Percina caprodes, logperch 
Several studies by the staff of the Section of fFaunistic Surveys 
of INHS have been completed or are in progress on the Big Creek 
biota. Published is a life history of Etheostoma squamiceps 
(INHS Biological Notes No. 89); in press, the life history of 
Etheostoma kennicottz; and in progress are a description of 
Onconectes kentuckiensis, and Cambanrus Laevis. 
Big Creek is at present under serious threat of overdevelopment. 
The stream banks are being cleared of trees, and if continued, 
will result in a raising of the water temperature and probable 
extirpation of those species in Big Creek dependent on the 
cool-water environment. The following steps are recommended. 
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