162 BULLETIN OF THE BUREAU OF FISHERIES. 



Bhuuchfhyn catdractiV: didcls Girard. 



This minnow was found to be rather common in Lake Creek, both above and 

 l)elow the lakes, Init only a few were noted in the lakes. Sometimes the fishermen 

 use tluMii for bait. 

 Sal III" xi'hiujo Girard. Landlocked Salmon. 



Th(> landlocked salmon was introduced several years ago, but apparently has not 

 nndtiplifd very rapidly. Only a few are caught. The tish attains a lathcr large 

 size, however, one that was caught weighing- <! and another \\ pounds. , 



Salmo xtniiilax Cope. Greenback Trout. 



The greenback is one of the two indigenous species of trout. It is common in 

 the lakes, apparently a little more abundant in Lower than in Upper lake. It does 

 not attain a very large size, rarely exceeding a pound in weight. It is caught chietly 

 by trolling in shallow water. 

 Sahiio initcdonaldl Jordan & Evermann. Yellow-fin Trout. 



The yellow-fin is the other indigenous trout — in fact, it has been found nowhere 

 else as yet. Jordan (1S91) has the following concerning its habits: ''The Yellow-fin 

 is largely on the gravels and about the north or sunny side of the lake. It is not 

 often taken in deep water. It spawns in spring and the suckers devour the spawn 

 in the streams and spawning beds.'' This trout appears to be very scarce now. No 

 specimens of it were otjtained. 

 Sidino i/rideus xlid.sfi/ Jordan. McCloud River Rainl>ow Trout. 



This trout has steadily increased in numbers since its introduction, and is ^lOW 

 the most abuiulant trout. It grows to a rather large size; one specimen was caught 

 in 1!H)3 wdiich weighed 10 pounds. The larger ones are caught chielly by trolling; 

 the smaller ones are frequently obtained by tl^y-fishing in shallow water. Fairly 

 large ones are often caught at the mouth of Lake Creek by Vjait-rishing from the shore. 

 Crist homei- inim<n/ciixh Walbaum. Mackinaw Trout; Great Lakes Trout. 



This trout has not increased very rapidly in numbers since its introduction into 

 Twin Lakes, but it seems to find conditions favorable for its growth. During the 

 first half of .June, 1903, a number of specimens w^ere caught which weighed from 15 

 to 20 i)oun(ls. Most of them were caught in the upper end of Lower Lake bj' still- 

 fishing. The fishermen used large hooks baited with pieces of suckers. 

 S(di;liii((s fi)nftii<dix Mitchill. Brook Trout; Speckled Trout. 



Brook trout areal)undant in Lake Creek above the lakes, and many are caught 

 in the lakes themselves. They are obtained chiefiy by fiy-fishing. In some cases, 

 also, the fisherman liaits his fiy hook with grasshoppers or maggots. 



IMPORTANCE OF STUDY OF nSH FOOD. 



In considering the life conditions of a living organism, one of the most impor- 

 tant factors to be taken into account is, naturally, the food. It is essential to know 

 something al>out the quantity and kind of food ref(uired not only for existence, but 

 also for the best and most complete develoj)ment of the organism. In agriculture 

 this question has received the attention of many investigators, and the results of their 

 labors are apparent everywhere. To mention oidy two instances : '\^'e know that 

 plants and soils have Ijeen studied to determine what plants are best adapted to the 



