temperature data for each station. The winter (Dec.-Feb.) 
and summer (June-Sept.) temperature readings define the 
year's temperature range for each station. 
In addition to listing the fishes collected at each station, 
the total number collected, number per square meter, relative 
density (number of a species collected/total number of fishes 
collected = percent), catch frequency (number of times the 
species was found at a station/total number of collections at 
that station), and an abundance index (relative density X catch 
frequency) are listed for each species of fish. The abundance 
index was computed to obtain a more complete comparative 
abundance measure which includes not only a measure of the 
number of a fish species caught (=RD), but also how consis- 
tently the species was collected (= catch frequency) at a 
station throughout the year. 
Station Descriptions 
Station 1 was an artificially constructed habitat, located under 
and along both sides of a railroad trestle. A moderate 
current from the swamp east of the railroad flowed under the 
trestle and produced a set of riffles at the west edge of the 
station. The average area sampled each month was approximately 
40 square meters and the average depth % meter, ranging from 
1/3 meter at theriffles to 1 meter directly under the rail- 
road bridge. The oxygen readings for November through March 
ranged from 5.6 to 11.3 ppm and averaged 8.4 ppm, and for 
April through October ranged from 1.3 to 8.4 ppm and averaged 
4.0 ppm. Water temperature averaged 6.7 °C for the winter 
’ readings and 24.2 °C for the summer readings. Station 1 con- 
tained very little vegetation; however, its outer perimeter 
was populated by Cephalanthus occidentakis and Nuphar advena 
and the surface often covered with duckweed. Twenty different 
‘fish species were collected at Station 1. 
Total No./m@ RD Catch Abund. 
Species No. Freq. Index 
Lepomis macrochirus 135 296 57.0 Baiy aad 
Gambusia affinis 37, , 081 1 istegl Ove 1 025 
*Fundulus notti 11 .025 4.6 -woS 15 
Etheostoma gracile 8 .018 3.4 .42 1E34 
*ELassoma zonatum 5 voll oe) Mae oi), Oni 
Micropteraus salmoides 4 .009 (bat 30 0.6 
Pomoxis annularis =o ei Ab Zia. SALI AU) AS 
*lLepomis punctatus 6-5 2015 2.5 ele 3004 
Lepomis gulosus 4 .009 aes, 25 0.4 
Notemigonus crysoleucas 4 .009 Few Zo 0.4 
Aphredoderus sayanus ay .009 Led, rOSey 40R2 
Dorosoma cepedianum 4 .009 Lest .08 Ue 
