412 



BULLETIN OF THE BUREAU OF FISHERIES 



GEOGRAPHICAL DISTRIBUTION 



Data in Table 36 and Figure 3 show reighardi in Superior to be confined to the 

 western sector of the lake from Ontonagon, Mich., to Grand Marais, Minn., and to 

 the islands blocking Nipigon Bay. The numerous sets of the special 23^ and 2% 

 inch nets made in other parts of the lake (see Table 24) have not revealed it, but 

 there is a bare possibility that it may occur elsewhere in habitats not explored. 



BATHYMETRIC DISTRIBUTION 



Pound nets were inspected only out of two ports on the north and west shores 

 of the lake, and at each inspection some examples of this species were taken. Those 

 gill-net sets in the area of distribution that were made near shore, so that part, at 

 least, of the gang fished at moderate depths, have recorded the species. It has 

 been absent from the special 2% and 2% inch nets set within its distribution area 

 only on October 4, 1921, off Bread Rock, Ontario, in 80 to 90 fathoms and on Sep- 

 tember 25, 1923, in Simpson Channel in 74 fathoms. It may be stated then, that 

 in the summer, at least, reighardi runs onto the shoals and is known to range out 

 to depths of 49 and possibly 65 fathoms, probably where such depths are attained 

 in the proximity of shore. 



RELATIVE ABUNDANCE 



Reighardi has been taken commonly only in the bays and channels along the 

 north shore of the lake. 



Specimens of reighardi were rare among the Leucichthys taken in the 2% and 

 2% inch nets lifted on August 24 and 25, 1921, 21 miles west and 6 miles NNW. 

 of Ontonagon, Mich., in 15 to 45 and 20 to 38 fathoms (records 1 and 2); July 11, 

 1922, between Cat and South Twin Islands in 15 to 20 fathoms (record 3); July 17, 

 1922, 20 miles NE. by E. of Duluth in 30 to 40 fathoms (record 4); and on September 

 14, 1921, off Terrace Point, Minn., in 30 to 65 fathoms (record 5). In the northern 

 bays it has been found common only in the shallower waters. Thus, in Thunder 

 Bay and vicinity, in the lift of special 23^-inch nets made on September 15, 1923,. 

 between Silver Island and the mainland in 14 fathoms and inside Thunder Cape 

 in 31 fathoms (records 8 and 9), and on September 17, 1923, inside the Welcome- 

 Islands in 11 fathoms and outside the Welcome Islands in 23 fathoms (records 10 

 and 11), and on September 19, 1923, in Thunder Bay off Sawyer Bay in 49 fathoms 

 (record 12), reighardi constituted 32 to 92 per cent of the coregonids taken. Far- 

 ther eastward, in the vicinity of Rossport, Ontario, in the lift made on September 

 25, 1923, in Moffat Strait in 13 to 14 fathoms, 17 per cent of the catch of coregonids 

 was of reighardi (record 18.) It was rare in the lift made on September 29, 1923, off 

 Salter Island in 42 fathoms (record 19). It was absent in the lift made on September 

 25, 1923, in Simpson Channel in 74 fathoms and on October 4, 1921, off Bread Rock 

 in the main lake in 80 to 90 fathoms. 



The species occurred in unknown numbers in the herring lifts made in Thun- 

 der Bay on November 25, 1922 (record 7.) These specimens were collected by 

 H. Walmsley, of Booth Fisheries, from the herring fishermen. Testimony of these 

 fishermen establishes that when the November herring run is on not infrequently 

 100 pounds or so of these fish are taken in a lift of several thousand pounds of herring, 



