GREAT LAKES COREGONIDS 



355 



Washington, Wis., in 65 to 48 fathoms; on September 3 and October 11, 1920, 22 

 miles NW. by N. Y 2 N. and 20 miles N. by W. % W. of Michigan City, Ind., in 

 30 to 40 fathoms (records 3, 5, 7-9, 14-18). Out of Frankfort, Mich., 9 miles 

 north of Point Betsie, on October 4, 1920, in 60 to 70 fathoms, chubs made up 7 

 per cent of a lift of 1,400 pounds (record 13). On August 23, 1920, 12 miles 

 E. by S. of the mouth of the Sturgeon Bay ship channel, in 60 to 70 fathoms, chubs 

 made up 22 per cent of the total lift (record 2), but as its weight was only 50 

 pounds, few chubs were taken. Chubs were found abundantly only in one lift 

 examined — when the nets were lifted on August 19, 1920, 20 miles E. Y N. of Rock 

 Island, Wis., in 71 to 90 fathoms (record 1). Out of a total lift of 900 pounds, 

 about one-third were chubs and the rest Jciyi. 



According to the records, then, the chub has not been common in the chub 

 hauls from less than 70 fathoms. The only set that took the fish in numbers was 

 made from a depth of 71 to 90 fathoms, the deepest lift examined. 



BREEDING HABITS 



Only an occasional fish was seen previous to August, 1920, and these fish were 

 not sexually mature. The specimens taken on August 19, 1920, 20 miles E. Yl N. 

 of Rock Island in 71 to 90 fathoms, were chiefly pearled males, from which milt 

 flowed freely. Females were not common and those taken were not yet ripe. While 

 it is certain that these fish would spawn soon, it is not certain that they would spawn 

 on the grounds where taken. Many of the stray fish taken up to October from 

 other ports were either males with pearls or spent females. It is safe to state, then, 

 that the spawning time for the species lies somewhere between the middle of August 

 and the last of September. It is not known at what depths and on what bottom the 

 species spawns. 



Leucichthys johannse of Lake Huron 



The johannse, of Lake Huron is like the typical form in body shape but differs 

 somewhat from it chiefly in the matters of certain proportions and of counts of 

 certain multiple parts. A comparison of some of the systematic characters follows : 



Gill rakers on the first branchial arch: 



Michigan, (26) 27-32 (36) » 



Huron, (25) 27-31 (35) .' 2 

 Lateral-line scales: 



Michigan, (74) 80-90 (95). 



Huron, (67) 77-87 (91). 

 L/H: 



Michigan, (3.8) 4-4.2 (4.4). 

 Huron, (3.4) 3.8-4.1 (4.3). 

 H/E: 



Michigan, (4) 4.4-4.6 (4.9). 

 Huron, (3.9) 4.3-4.8 (5.3). 



» These figures for Lake Michigan are given for 122 specimens. Unmarked figures are given for 74 specimens ranging in length 

 from 212 to 288 millimeters. 



12 Figures for gill rakers are based on 441 specimens, those for scales on 258 specimens. All other figures for Lake Huron, unless 

 marked, are based on 219 specimens ranging in length from 200 to 332 millimeters. 



