LAMPREYS AND FISHES OF INDIANA. 231 



diminish in numbers with catching. They are not so highly regarded 

 for food as are the other species of the Salmonidse. They are small and 

 thin when opened, and become shrunken Avhen pickled. They may, 

 however, be made into a most delicious article of food by a slight pickling 

 in salt 'brine and then exposing them to the smoke of a hot fire for a 

 short time. The fresh fish command a low price in market. The fish 

 has a terminal niouth and readily takes the hook. Their usual food 

 seems to be certain insects and small crustaceans. They also appear to 

 be great devonrers of fish spawn, even of their own. They spawn about 

 the middle of November, and the eggs probably hatch about the middle 

 of May. 



Professor Forbes (i4> 2, 437) found that this fish subsists on small 

 crustaceans (Dap/ima, Bosmina, Cyclops, etc.) and terrestrial insects. 

 Smith (4, '92, 207) states that the Cisco also eats fishes. One was taken 

 in Lake Ontario with a large ale-wife in its mouth. 



COREGONUS NIGRTPINNIS (Gill). 



Blue fin; Black-fin. 



Jordan and Gilbert, 1882, 8, 301 ; Jordan, 1884, 12, 541. 



Body deep and much compressed. Depth in length three and three- 

 quarters. Head compressed, pointed, in length four times. Snout in 

 the head four times, equal to diameter of the eye. Mouth large, termi- 

 nal, the lower jaw projecting beyond the upper, the maxillary reaching 

 back to the hinder border of the pupil. A few minute teeth on the jaws. 

 Gill-rakers long and slender. Dorsal rays ten, anal eleven or twelve. 

 Scales 9-88-7. Dark bluish above, sides silvery. Fins blue-black. 

 Length as great as twenty inches. This fish is a resident of the deep 

 waters of Lake Michigan. It appears to be moderately abundant. Mil- 

 ner (11, '72-73, 35) says that it is most abundant in seventy fathoms of 

 water and deeper, and are seldom taken in the fishing season even in as 

 great a depth as fifty fathoms. At Grand Haven, Mich , it is taken 

 during December in thirty to forty fathoms. That it has been actually 

 taken in Indiana waters I am not certain.- 



Genus SALVELINUS Ricliardson. 



Teeth on the jaws and palatines and tongue. Vomer boat-shaped ; 

 no teeth on its shaft. Scales very small, one hundred and seventy-five 

 or more along the lateral line. Color dark, with red or gray spots. A 

 genus containing a considerable number of beautiful fishes, among which 

 is the brook trout (;S'. fontirialis) , not a resident of Indiana, and the fol- 

 lowing : 



