Fish Population Estimates 



105 



Table 2. (Continued) 



Species N 



Bowfin 74 



American eel 334 



Eastern mudminnow . . . 801 



Redfin pickerel 5960 



Chain pickerel 



Golden shiner 667 



Creek chubsucker 79 



Yellow bullhead 3121 



Brown bullhead 1586 



Tadpole madtom 



Pirate perch 4159 



Mud sunfish 35 



Flier 1952 



Blackbanded sunfish .... 



Bluespotted sunfish 326 



Banded sunfish 1001 



Pumpkinseed 17 



Warmouth 49 



Bluegill 



Largemouth bass 



Black crappie 



Swamp darter 



Sawcheek darter 



TOTALS 20161 



Section 34 







CL 



B 



%N 



%B 



(54-®) 



27.6 



.4 



5.0 



(208-oc) 



4.7 



1.7 



.9 



(408-od) 



7.2 



4.0 



1.3 



(5083-7440) 



208.5 



29.6 



38.1 



(566-927) 



6.1 



3.3 



1.1 



(59-420) 



2.8 



.4 



.5 



(1433-O0) 



112.2 



15.5 



20.5 



(882-30500) 



77.7 



7.9 



14.2 



(3425-5513) 



24.9 



20.6 



4.5 



(*-*) 



1.5 



.2 



.3 



(1762-2271) 



68.3 



9.7 



12.5 



(158-oo) 



1.9 



1.6 



.3 



(549-18898) 



* 



5.0 





(*-*) 



* 



.1 





(37-oo) 



4.4 



.2 



.8 



547.8 



were estimated by considering R (recaptures) as a binomial and using 

 tables of confidence limits of binomial proportions (Mainland et al. 1956). 

 The 80 percent level of confidence was selected for use in examining these 

 estimates, as variability is often high in field studies of fish and wildlife 

 populations and an 80 percent confidence level is often adequate for 

 ecological evaluation and management. 



There was considerable variation in numbers of fish between the sam- 

 pled sections of Duke Swamp, with estimates ranging from 6630 fish 

 weighing 195.1 kg per surface hectare to 33,734 fish weighing 956.9 kg 

 (Table 2). Redfin pickerel, Yellow bullhead, Pirate perch and American 

 eel, the most abundant fishes collected (pooled estimates), made up 69.0 

 percent of the estimated total. Large differences existed among species in 

 the variation in population estimates between study sections. For exam- 

 ple, Creek chubsucker estimates varied considerably between sections 

 while Redfin pickerel were abundant in all sections. 



