100 NORTHERN FISHES 



late November at a depth of from 20 to 40 fathoms. They feed on small 

 planktonic crustacca and on small bottom insects and the crustacean 

 Pontoporeia. 



GREAT LAKES BLOATER 



Leucichthys hoyi (Gill) 



The bloater has an elliptical shape and is small, ranging from 6 to 8 

 inches in length. The lower jaw is longer than the upper and is more or 

 less hooked. The gill-rakers of the first branchial arch usually number 

 more than 40. It resembles L. kiyi but differs from it in usually having 

 less than 75 scales in the lateral line, whereas L. kiyi has more than that 

 number. 



L. hoyi lives in deep water. Koelz (1929) reports it to be most abun- 

 dant at depths ranging from 40 to 50 fathoms, but it has been taken in 

 water as shallow as 15 fathoms and as deep as 90. This species is found 

 on the slopes of the banks and shores of Lake Superior and Lake Michi- 

 gan and according to Koelz apparently does not occur in the deep, open 

 waters. It has little value commercially because of its small size. Koelz 

 states that it probably spawns during the winter. 



MICHIGAN KIYI (Chub) 

 Leucichthys kiyi kiyi Koelz 



The kiyi, or chub, has an ovate shape and is small, reaching a length 

 of 6 or 8 inches. The lower jaw is longer than the upper and is more or 

 less hooked. The fish resembles L. hoyi, but the scales in the lateral 

 line number more than 75. 



The kiyi lives in the deep water of Lake Superior but is not common. 

 Koelz reports taking them in nets at depths of not less than 20 fathoms 

 and ranging down to 100 fathoms. They live in deeper water than 

 L. hoyi. Most of the records reported by Koelz are from Michigan 

 waters. Kiyis have no commercial value because of their small size. 

 They feed on the small crustacean Mysis. Koelz reports this fish as 

 spawning probably in deep waters in late November or early December. 



BLUEFIN 



Leucichthys nigripinnis cyanopterus 



Jordan and Evermann 



The bluefin found in Lake Superior was originally described by Jordan 

 and Evermann as L. cyanopterus. Koelz (1929) placed this fish as the 

 Lake Superior variety of the blackfin. L. nigripinnis (Gill) , found in 

 Lake Huron and Lake Michigan. The blackfin was formerly called 

 L. prognathus (Smith) . The bluefin differs from the typical blackfin in 



