360 



BULLETIN OF THE BUREAU OF FISHERIES 



Thus my records show that the extreme range of the species when not spawning 

 extends from 16 to 100 fathoms. Examples are taken but rarely in less than 35 

 fathoms, and therefore 15 fathoms probably is the lower limit of the range. There 

 are no data that fix the upper limit. Probably the chub occurs also in the deepest 

 waters of the lake. 



From the chub nets in 50 fathoms and deeper lifts were examined on 22 occa- 

 sions. (Examinations of the lifts off Cheboygan, Mich., and Rogers, Mich., at 35 

 to 50 fathoms, in which only spawning zenithicus were taken, have no value in 

 determining the abundance of other species of chubs at these depths, and therefore 

 they are not included in this number.) The majority of chubs seen in Lake Huron 

 were yielded by lifts out of Alpena, Mich. Lifts made at the center of the lake in 

 60 to 80 fathoms northeast and east of Alpena on September 7, 1917 (record 8), 

 September 10, 1917 (record 10), September 12, 1917 (record 11), September 14, 

 1917 (record 12), September 17, 1917 (record 13), September 26, 1917. (record 20), 

 and October 17, 1917 (record 21); on August 7, 1920, 19 miles NE. M N. of Thunder 

 Bay Island in 60 to 65 fathoms (record 27); on August 30, 1919, 18 miles N. by 

 E. Yi E. of Thunder Bay Island in 60 to 64 fathoms (record 23); on September 3, 

 1919, 28 miles E. S. of the can buoy in 60 to 64 fathoms (record 24); and on 

 June 30, 1923, 17 miles NE. % N. of Thunder Bay Island in 65 to 70 fathoms (record 

 29), contained 50 to 90 per cent chubs. Lifts from the center of the lake made on 

 September 21, 1917 (record 18), September 24, 1917 (record 19), October 20, 1917 

 (record 22), and on June 28, 1923, 19 miles northeast of Thunder Bay Island in 

 60 to 70 fathoms (record 28), and on July 7, 1923, 13 miles NE. % N. of Thunder 

 Bay Island in 60 fathoms (record 32) had 20 to 47 per cent chubs. Relatively few 

 chubs were taken on July 2, 1923, 20 miles E. by N. of the can buoy in 60 to 70 

 fathoms (record 30), and on July 5, 1923, 18 miles NE. % E. of Thunder Bay Island 

 in 80 to 100 fathoms (record 31). 



A single lift from 50 fathoms 35 miles NE. by N. % N. of Harbor Beach, Mich., 

 on October 27, 1917 (record 33), had 50 per cent chubs. On the Ontario shore of the 

 lake lifts were examined only in Georgian Bay. Though no chubs were collected or 

 examined from the Duck Islands and Southampton boats, the fact that the move- 

 ments of the fish caught by these boats and by the Alpena boats (as shown by their 

 records) are similar and the fact that all three boats fish in approximately the same 

 zone of latitude in the lake give circumstantial evidence that the lifts at the three 

 ports can not be widely different in their components. (See Table 14 and discussion 

 on p. 346.) In Georgian Bay, off Cape Croker, in 52 fathoms on July 28, 1919 (record 

 37), and on July 30, 1919, 21 miles east of Surprise Shoal in 60 fathoms (record 34), 

 chubs made up half the catches. In a single lift made on October 6, 1919, off White 

 Bluff in 70 fathoms (record 35), only a few chubs were taken. 



In other types of netting chubs were recorded only as follows : In the trout nets 

 lifted on September 7, 1917, 26 miles SE. by E. 34 E. of the Alpena can buoy in 16 to 

 20 fathoms and in the l^-inch nets lifted on September 8, 1917, 26 miles SE. by E. 

 Y± E. of that point. In both lifts chubs were rare. 



All observations show the chub to range from 16 to 100 fathoms. In less than 35 

 fathoms it has been taken rarely. In the chub nets from 35 to 50 fathoms it is taken 



RELATIVE ABUNDANCE 



