Yellow Bullhead. -- This is the common bull- 

 head of Jordan Creek, and specimens were taken in 

 all eight divisions. Because of their dark color 

 and preference for cover along the stream bank, 

 yellow bullheads were difficult to collect with an 

 electric shocker. Most of the young-of-the-year 

 were found at the edges of shallow riffles. The 

 largest individual collected was 9.7 inches in 

 length and weighed 0.55 pound. 



Stonecat. — Fish of this species were collected 

 in only the four lower divisions of the study section, 

 where generally they were found under stones in 

 the larger riffles. 



Brindled Madtom. -- The madtom was taken in 

 eight collections. Six of these collections also 

 contained the stonecat. The madtom was restricted 

 to rapids of the lower area, occurring in only 

 Divisions 1 and 2. 



Darter Family 



The numerical abundance of darters in relation 

 to the other families of fishes, table 9, was directly 

 proportional to the steepness of the stream gradient. 

 The actual numbers and weights of darters collected 

 in each division, table 8, was influenced largely 

 by the abundance of the four common species, table 

 5. For example, the greatest weight of darters was 

 recorded for Division 1, where the large green- 

 side darter was abundant. 



Blockside Darter. — Only six specimens of this 

 darter were taken. These were in separate collec- 

 tions and all were from the wooded area, in water 

 of moderate depth and velocity. 



Logperch. — One specimen was taken in a 

 shallow, sandy pool in the upper area. 



Johnny Darter.-- This species was found in 

 somewhat deeper waters than were the other darters 

 and, because of this, it was more difficult to 

 collect with the electric shocker. It was taken in 

 greatest numbers in the upper three divisions, 

 where it was associated with sandy bottoms. 



Rainbow Darter. --The abundance of this 

 darter decreased progressively upstream. It was 

 most numerous in the larger, steeper riffles of the 

 wooded area. 



Orangethroat Darter. -- This species closely 

 resembles the rainbow darter in appearance, but 

 its distribution in Jordan Creek was strikingly un- 

 like that of the rainbow, fig. 24. Orangethroats 

 increased in numbers upstream; 85 per cent of the 

 specimens were taken in the upper, exposed area. 

 Usually they were found either just above, below, 

 or at the edges of the riffles and not so frequently 

 in the most rapid currents. 



Fantail. --This was the most numerous darter 

 in Jordan Creek. It was commonly taken at the 

 edge of, or just above, riffles and was more nu- 

 merous in the upper half of the study area than in 

 the lower. 



Greens ide Darter. -- Rapid, rocky riffles were 

 the characteristic habitat for this darter, which was 

 more abundant in the wooded part of the study area 

 than in the open part. 



Sunfish Family 



By weight, fish of the sunfish family appeared 

 to be about equally distributed between the lower, 

 wooded area and the upper, open area; by number, 

 71 per cent were taken in the open area, table 8. 

 This lack of weight-number consistency was the 



Table 5. — Number of each of the species of darters collected, 1950, in each of the eight divisions of 

 Jordan Creek, and the total number of each species collected in all divisions combined. 



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