lo University of Michigan 



or four inches high. When last seen at mid-afternoon on June 3, 

 it was about a foot in diameter and not nearly so high. 



During the period of my observations the fish carried stones 

 to the pile holding them in his mouth, laboring in an active and 

 tireless way, making dozens of excursions usually up stream and 

 obtaining the stones chiefly from points two or three feet away. 

 Stones as large as two inches in diameter were brought at times, 

 but with such loads the fish would enter the strongest part of the 

 current and allow this to assist higi. Only once was he seen to 

 drop a stone short of the pile. At one time he worked at the center 

 of the pile as if trying to make a little pit in it. Spawning was 

 not observed; in fact no other creek chubs were at the place except 

 a few very small ones associated with the little common shiners, 

 and perhaps other minnows, that were schooling near the nest. 



About eight feet away from this nest, however, another large 

 male river chub was building a stone pile. At one time the two 

 males met and a little combat ensued, ending in one applying its 

 side to the back of the other and holding the position for a second 

 or two. Possibly this was the spawning position of the species 

 assumed through the mistaking of sex. 



18. Umbra limi (Kirtland), Mud Minnow. — None were found 

 in the river but some were taken in both of the tributary creeks 

 in the Warren Woods, Stations 26 and 46. 



19. Esox lucius Linnaeus, Common Pike. — Three taken, two 

 rather large, thirteen to fifteen inches long, at Stations 25 and 30 

 and one small one three inches long from Station 50. The one 

 from Station 25 was taken by hook in August with a minnow as 

 bait. They are said to reside in deep holes in the river where 

 anglers obtain considerable sport in fishing for them and where 

 they occasionally catch large ones, as large as seven and a half 

 pounds according to Mr. Sawyer. The pike are quite generally 

 blamed for the scarcity of large minnows, suckers, and some other 

 fish in the river. 



