30 EEPOET OF THE COMMISSIONER OF FISHERIES. 



trout has obtained a sufficient foothold in an}- New Eng-land waters to 

 maintain itself by natural reproduction. Enduring' as it does a some- 

 what higher temperature than the nativ^e trout, it was hoped it would 

 succeed in w\aters which, owing- to deforestation or other causes, have 

 become unsuited to the latter. 



The successful acclimatization of the steelhead trout in Lake Super- 

 ior and other inland waters makes it desirable to propagate this species 

 on a larger scale. The latest reports from Lake Superior give infor- 

 mation that the steelheads spawned last spring in nearl}^ all of the 

 tributary streams along the north shore of the lake. 



The landlocked salmon has been successfully introduced in several 

 ponds in ISIaine where it is not indigenous, and in Pierce Pond with 

 marked results. This pond is 9 miles long, about three-fourths of a 

 mile in width, and over 100 feet deep in places, and is practically land- 

 locked. The plant was made eight j^ears ago and forgotten until the 

 summer of 1903, when one specimen was caught weighing 16i pounds, 

 one 14 pounds, several 12 pounds, and some 9 and 7 pounds. Quite 

 a number weighing 5 pounds were caught, and these were the smallest 

 taken. When the above information was received, these salmon were 

 said to be quinnats, the result of plants made nine 3"ears ago, but an 

 investigation has demonstrated that the introduction of the quinnat 

 salmon proved a failure. It would be interesting to learn the results 

 of a similar investigation of the reported success in acclimatization of 

 quinnat salmon in certain fresh-water lakes in France. 



FISH-CULTURAL NOTES. 



In addition to the regular work of propagation, tish-cultural experi- 

 ments have been conducted at various points. 



It being a recognized fact that landlocked salmon from Green Lake, 

 Maine, have a much greater average weight than those from Grand 

 Lake Stream, it was determined to compare the rate of growth by 

 carrying through the season at the Craig Brook station parallel series 

 of lish from these waters. It was shown that under similar conditions, 

 and with the same water supply for a given length of time, landlocked 

 salmon of Green Lake grew more rapidly than those of Grand Lake 

 Stream; the Green Lake fish also showed greater endurance, there 

 being a smaller mortality among them than among the Grand Lake 

 Stream lot. 



For observation and experiment in the domestication of landlocked 

 salmon, one brood hatched from the eggs of 1899 was maintained in 

 the most capacious pond available, and a special study was made of 

 the development of the reproductive organs and the character of the 

 oifspriug. The lot comprised 173 fish, confined in a pond with an 

 area of 45 by 60 feet and a mean depth of about 6 feet, and in Novem- 



