BULLETIN OF TIIE UNITED STATES FISH COMMISSION. 243 



United States, and which, in our opinion, is closely related to our "Ma- 

 rline," has in America reached a very high degree of perfection. Enor- 

 mous numbers are hatched in numerous piscicultural establishments, the 

 one at Northville, under the direction of Mr. Frank N. Clark, annually 

 producing 15,000,000 to 20,000,000. The watching of the exceedingly 

 small coregonus eggs, and the separating of the spoiled eggs from the 

 healthy ones, has hitherto been an almost insurmountable difficulty 

 with us ; but in America this is managed in the most ingenious manner, 

 the never-resting inventive genius of the Americans having produced 

 a series of apparatus — one more ingenious than the other — which leaves 

 the separating of the spoiled from the healthy eggs to the gentle force 

 of an exactly regulated current, a self-picking system. 



Quite recently Messrs. McDonald & Brown have taken out a patent 

 for such a self-picker, which will be described in a future circular. It 

 is well-known that our honored friend Yon dem Borne has also invented 

 a self-picking apparatus, which is constantly gaining greater favor in 

 Germany for hatching coregonus eggs. As Raveret-Wattel reports, 

 the highly-prized whitefish is now — thanks to the large number of young 

 fry furnished by the hatching establishments— found in very large num- 

 bers in many lakes in the United States, where formerly it was un- 

 known ; not only in the Eastern States, its proper home, but as far as 

 California. According to the same author, the whitefish in some lakes 

 reaches a weight of 20 to 40 pounds, whilst in others it only has an 

 average weight of 2 pounds. 



The report of Raveret-Wattel contains much interesting matter with 

 regard to pisciculture in the United States. The publication of the 

 " SocietC d ? Acclimation " in Paris, containing this report, is to be found 

 in the library of the German Fishery Association. 



It has been mentioned as an advantage which the whitefish possesses 

 over our " Marline," that it is an excellent fish for hook and line fishing. 

 Its flavor is very delicious, and of a kind that one does not easily tire 

 of. It is, therefore, not to be wondered at that I gladly accepted the 

 offer of eggs of this fish. 



The success of shipping these eggs, during both winters, has been 

 almost miraculous. Thanks to the excellent manner in which they were 

 packed, there was hardly any loss during the voyage, and the young 

 fry developed very successfully. The eggs were divided between the 

 Lake of Constance, the Walchen Lake, and Ammer Lake in Bavaria, and 

 the Madue Lake, the Schaal Lake, and some lakes in Mecklenburg, all very 

 deep ; and it is to be hoped that in three to four years we shall reap a rich 

 harvest of these fish. Further particulars as to the distribution of these 

 eggs are contained in Von dem Borne's reports in our circulars for the 

 years 1881 and 1882. 



V. The fifth salmonidae which has been successfully introduced into 

 Germany from the United States, is the Salmo iridea (rainbow-trout). 



Even in the illimitable territory of the American Union this fish (which 



