228 REPORT OF THE COMMISSIONERS OF 



The male from Winnepesaukee Lake has : 



B. 12 to 13; D. 10; A. 10; V. i, 8; P. 1 2 ; gill-rakers 8 plus 12, the longest about one- 

 half as long as the eye. The ground color is a little lighter than in the Newfound lake trout, 

 and the vermihon of the pectorals, ventrals and anal is less intense. The spermaries are larger 

 than in the specimen from Newfound, and in about the same stage of development ; the body is 

 considerably stouter. 



The female from Roxbury, Vermont, shows the following additional characters: 



B. 12; D. 10; A. 10; V. i, 8; gill-rakers 8 plus 12, the longest exactly one-half as long as 

 the eye. The eggs and ovaries are small as in young females. The pectorals, ventrals and 

 anal area chiefly vermilion as in the male from Newfound Lake. The body is silvery gray with 

 numerous small, whitish spots, these present also upon the dorsal. 



50. Salvelinus fontinalis {Mitchill). Brook Trout; Si-eckled Trout. — 

 Brook trout have been received from New York Fish Commission stations at 

 Caledonia and Cold Spring Harbor, from the private establishment of Mr. James Annin, 

 Jr., the preserve at Oakdale, Long Island, of the South Side Sportsmen's Club, the 

 Maine Fish Commission, from Mr. John W. Titcomb, President, Vermont Fish and 

 Game Commission, Mr. E. G. Blackford, New York, and Mr. A. N. Cheney, State 

 Fish CultLirist of New York. The only brook trout that endured the high temperature 

 (76°) of the Croton water in June, 1897, was one young individual from Caledonia. 

 The Vermont trout were saved by sending them to Cold Spring Harbor in May. 



The food of the trout in the Aquarium consists almost entirely of chopped hard 

 clams and liver for the young, and hard clams, live killifish, and occasionally earth 

 worms for the larger ones. Their increase in weight has been remarkable; an 

 individual from Caledonia, for example, received in Noveinber, 1896, as a fingerling 

 not above 31/ inches long, is now (December 10, 1897) i 2 i{ inches long, and 3)^ 

 inches deep. This species will live indifferently in the fresh and salt water of the 

 Aquarium. When attacked by fungus in fresh water the parasite is easily killed by- 

 keeping the fish in salt water, and the trout is not at all injured or inconvenienced by 

 this treatment if the transfer be made gradually, that is, from fresh to brackish, and 

 finally salt water of the salinity here founil (about 1.017). A trout so treated and 

 cured has practical immunity from fungus attacks thereafter. The brook trout is well 

 adapted to domestication in tanks : it soon overcomes its fear of moving objects, takes 

 its food regularly, and is always attractive because of its beauty and grace of 

 movement. 



51. Osmerus mordax {Mitchill). S.melt. — The smelt is found in Gravesend 

 Bay in winter, beginning to run in December, and remaining during cold weather. 

 In the spring it ascends rivers to spawn. The eggs are small and adhesive. The fry 

 are hardy in transportation. In the Aquarium the adults live until about the end of 



