162 BULLETIN OF THE BUREAU OF FISHERIES. 



JShinichthys cata/racta dulcis Girard. 



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

 below the lakes, but only a few were noted in the lakes. Sometimes the fishermen 

 use them for bait. 

 Salmo sebago Girard. Landlocked Salmon. 



The landlocked salmon was introduced several years ago, but apparently lias not 

 multiplied very rapidly. Only a few are caught. The fish attains a rather large 

 size, however, one that was caught weighing 6 and another 4£ pounds. 

 Sal inn xfoiiiitix 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 chiefly 

 by trolling in shallow water. 

 Salmo macdonaldi .Jordan & Evermann. Yellow-rin Trout. 



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

 else as yet. Jordan (1891) has the following concerning its habits: ''The Yellow-tin 

 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 obtained. 

 Salmo irideus skasta Jordan. McCloud River Rainbow Trout. 



This trout has steadily increased in cumbers since its introduction, and is now 

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

 in 1903 which weighed lit pounds. The larger ones are caught chiefly by trolling; 

 the smaller ones are frequently obtained by fly-fishing in shallow water. Fairly 

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

 Cristwomer namaycush 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 Dumber of specimens were caught which weighed from 15 

 to 2<t pounds. Most of them were caught in the upper end of Lower Lake by still- 

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

 Sal r, I in us font! mil is Mitchill. Brook Trout; Speckled Trout. 



Brook trout are abundant in Lake Creek above the lakes, and many are caught 

 in the lakes themselves. They are obtained chiefly by fly-fishing. In some cases, 

 also, the fisherman baits his fly hook with grasshoppers or maggots. 



IMPORTANCE OF STUDY OF FISH 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 about the quantity and kind of food required not only for existence, but 

 also for the best and most complete development 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 only two instances : We know that 

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



