102 



William H. Tarplee, Jr. 



Table 2. Population estimates of fishes collected from Duke Swamp, May through 

 August 1972. N = number of each species per surface hectare; CL = 

 80% confidence limits; B = biomass in kg per surface hectare; %N = 

 percent of total number; %B = percent of total biomass; * = data not 

 available or < 0.1; and °o = infinite. 



Species 



Bowfin 



American eel 



Eastern mudminnow 



Redfin pickerel 



Chain pickerel 



Golden shiner 



Creek chubsucker . . 

 Yellow bullhead .... 

 Brown bullhead .... 

 Tadpole madtom . . . 



Pirate perch 



Mud sunfish 



Flier 



Blackbanded sunfish 

 Bluespotted sunfish . 



Banded sunfish 



Pumpkinseed 



Warmouth 



Bluegill ..• 



Largemouth bass . . . 



Black crappie 



Swamp darter 



Sawcheek darter .... 



TOTALS 





Section 1 







N 



22 



. 121 



7 



. 1871 



40 



12 



CL 



(62-co) 

 (5-oo) 



(1240-4549) 



(*-*) 



(*-*) 



(255-1003) 



(541-18688) 



(72-oo) 



(640-2031) 

 (54- co) 



(546- oo) 



(72-co) 



(126-oo) 



(*-*) 

 (42- off) 

 (106-oo) 



(*-*) 

 (*-*) 

 (*-*) 

 (12-co) 



B 



8.3 



1.7 



.1 



65.5 



2.6 



.1 



13.1 



35.6 



4.8 



6.5 



4.5 



41.0 

 * 



1.6 



* 



7.1 



2.6 



* 



* 

 * 

 * 



%N 



.3 



1.8 



.1 



28.2 



.6 



.2 



5.5 



14.9 



1.5 



16.3 

 1.6 



17.7 

 2.1 

 3.9 



.0 

 1.2 

 3.3 

 .2 

 .2 

 .0 

 .3 



%B 



4.3 



.9 



.1 



33.6 



1.3 



.1 



. 363 



991 



99 







. 1082 



6.7 

 18.2 



2.5 



3.3 



109 



2.3 



. 1174 



21.0 



136 



. 259 







.8 



2 





79 



3.6 



217 



1.3 



10 

 10 





2 





22 





195.1 



The variation in volume of stream flow through a year had considerable 

 influence on stream width due to the nearly uniform topography of the 

 watersheds. Rises in stream level of approximately 1 m caused width in- 

 creases of up to 0.8 km. 



Population Estimates 



Four study sections were randomly selected in each stream for fish pop- 

 ulation sampling. Sampling was conducted during summer low water 

 periods using a combination of capture methods in an attempt to reduce 

 bias from gear selectivity. Sections were blocked off with nets, and cylin- 

 drical poultry-wire traps, gill nets, a seine and a backpack Smith Root 

 Type V electrofishing unit were used for collecting fish. 



