444 



BULLETIN OF THE BUREAU OF FISHERIES 



Kiyi can be confused only with small artedi, as the former is not known to grow 

 large. The body shape of Tciyi is ovate, as seen from the side, as compared with the 

 elongate elliptical form of artedi; the gill rakers on the first branchial arch are fewer, 

 and the paired fins, maxillary, head, and eye are relatively longer, as will appear 

 from the figures given: 



Gill rakers on the first branchial arch: 



kiyi, (36) 37-41 (45), with 24 per cent more than 40. 



artedi, (41) 45-48 (53). 

 L/H: 



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



artedi, (4) 4.2-4.6 (4.8), with 92 per cent more than 4.1. 

 H/E: 



kiyi, (3.4) 3.5-3.8 (4.1), with 3 per cent more than 3.9. 

 artedi, (3.4) 4-4.2 (4.5), with 77 per cent more than 3.9. 

 H/M: 



kiyi, (2.2) 2.4-2.5 (2.6). 



artedi, (2.5) 2.7-3 (3.2), with 88 per cent more than 2.6. 

 Pv/P: 



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



artedi, (1.6) 1.9-2.2 (2.3), with 90 per cent more than 1.7. 

 Av/V: 



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



artedi, (1.4) 1.5-1.8 (1.9), with 95 per cent more than 1.4. 



In addition, Tciyi has, on the average, fewer lateral-line scales, a longer snout, 

 and a longer mandible. Few specimens of artedi have been found sexually mature ' 

 under 200 millimeters, while Tciyi commonly is mature at 140 millimeters. 



GEOGRAPHICAL DISTRIBUTION 



All my data on the occurrence of the Tciyi in Lake Superior (11 records) are 

 assembled in Table 52 and are platted in Figure 3. By comparison with a similar 

 table for Tioyi (Table 60), it appears that Tciyi is distributed by no means so generally 

 as the former; and from all the data at hand it can be stated with certainty only 

 that the species occurs in the deeper waters of the southern half of the lake. Its 

 absence in the inspected catches from apparently suitable depths in the northern 

 sector must not be taken to indicate its absence in this area, however, especially when 

 its rarity in the south, except during the breeding season, is taken into consideration; 

 and further investigation probably will discover the species throughout the lake 

 where conditions are suitable. 



BATHYMETRIC DISTRIBUTION 



Kiyi is preeminently a deep-water form in Lake Superior, as in all the other 

 lakes in which it is known to occur. Of the 11 lifts that have yielded specimens, 

 4 were made at unknown depths, but probably from at least 40 fathoms. Only one 

 of the rest was made as shallow as 40 to 50 fathoms (record 11). The remaining 

 specimens collected were taken from sets that, if they ranged as shallow as 40 or 50 

 fathoms, extended also to greater depths (records 3, 9, and 10). Except during 

 the spawning season (records 5 and 6), the majority of specimens collected came 

 from a gang of nets set in 100 fathoms (record 2). It is interesting to note by com- 

 parison with Table 60, which shows the data on the occurrence of Tioyi, that Tciyi 



