442 



BULLETIN OF THE BUREAU OF FISHERIES 



off Presque Isle Light on September 13, 1919 (record 11), took only 8 kiyis among 

 some hundred other fish. 



BREEDING HABITS 



Nothing is known of the breeding habits of Jciyi. Female specimens collected as 

 late as October 17 and 20, 1917, showed eggs approaching maturity, and probably 

 the species spawns during October or November. October is said to be the time of 

 spawning in Lake Michigan. 



FOOD 



The contents of 20 stomachs of specimens taken off Alpena, Mich., on September 

 19, 1919, in more than 60 fathoms consisted almost exclusively of Mysis. One 

 specimen had swallowed a Pisidium, one a developing Leucichthys egg, and three 

 had picked up fragments of wood. 



Leucichthys kiyi kiyi of Lake Superior 



The Tciyi of Lake Superior resembles the typical form in shape and appearance, 

 but apparently it does not grow so large, as the largest individual seen measured only 

 204 millimeters, compared with a recorded maximum of 245 millimeters for the Lake 

 Michigan form. The chief systematic characters that can be expressed numerically 

 are compared below: 



Gill rakers on the first branchial arch: 

 Michigan, (34) 36-41 (45) . 3 

 Superior, (36) 37-41 (45) * 



Lateral-line scales: 



Michigan, (71) 77-87 (91). 

 Superior, (72) 76-84 (87). 



L/H: 



Michigan, (3.7) 3.8-4.1 (4.3). 

 Superior, (3.5) 3.7-3.9 (4.1). 



H/E: 



Michigan, (3.6) 3.8-4.2 (4.3). 

 Superior, (3.4) 3.5-3.8 (4.1). 

 Pv/P: 



Michigan, (1.1) 1.4-1.7 (2.1). 

 Superior, (1.1) 1.3-1.5 (1.7). 

 Av/V: 



Michigan, (0.9) 1-1.3 (1.4). 

 Superior, (0.9) 1-1.2 (1.4). 



It appears that the Superior kiyi has somewhat fewer scales in the lateral line 

 and an average larger head and eye and longer pectoral fins. As the Superior speci- 

 mens are much smaller than those that have been examined from Michigan, the 

 differences in proportions involving the head and eye are such as might be expected 

 and a comparison of these characters is not conclusive. In addition, the Superior 

 form has, on the average, a longer anal base but with only slightly if any more anal 

 rays, and in relation to the head a shorter snout, longer jaw, and longer gill rakers. 

 Except for the head-snout proportions, which for Superior specimens is (3.3) 3.5-3.7 

 (4.1) 5 and for Michigan specimens (3.2) 3.4-3.6 (3.9), and for anal rays, which for 

 Superior specimens are (10) 11-12 (14) 6 and for Michigan specimens (9) 10-12 (16), 7 

 the other characters are, for the most part, so variable that they are not given in 

 fuller detail than is shown in the analysis of 10 specimens from each lake in Tables 

 49 and 53. 



3 These and unmarked figures for Lake Michigan are based on an examination of 174 specimens that range in length from 

 122 to 245 millimeters. 



« These and unmarked figures for Lake Superior are based on an examination of 81 specimens ranging in length from 132 to 204 

 millimeters. 



5 Sixty-six specimens. 



6 Sixty-two specimens. 



i One hundred and forty-four specimens. 



