[67] FISHEEIES OF THE UNITED STATES. 1221 



The United States fish-hatchery, Alpena, Mich. — Cont'd. 



soon as hatched, and to prevent their escape the tanks are pro- 

 vided with overflows of finely perforated tin, in the shape of a 

 box of sufficient dimensions to keep the minnows away from 

 the strong current at the point of overflow. There are ten of 

 these tanks provided for the reception of the minnows, the 

 aggregate capacity being 7,000 gallons. 



TJ. S. Fish Commission steamer Fish Hawk. 



A model of the TJ. S. Fish Commission steamer Fish Hawk, built by 

 Pusey & Jones, of Wilmington, Del. 



TJ. S. Fish Commission steamer Fish Hawk. 



Sectional model of the TJ. S. Fish Commission steamer Fish Hawk, 

 on a scale of 2 inches to the foot, showing the hatching deck 

 properly equipped with fish-hatching apparatus and the ar- 

 rangement of hatching boxes on the outer side. 



C. PHOTOGRAPHS OF HATCHING HOUSES AND PONDS. 



Fixed hatcheries. 



SCHOODIC HATCHERY. 



Photographic view of the station of the TJ. S. Fish Commission for 

 hatching eggs of the land-locked salmon. Size, 8 by 10 inches. 

 Grand Lake Stream, Me., 1882. (770)2,228. U. S. Fish Com- 

 mission. 



SCHOODIC HATCHERY. 



Photographic view of the hatching station of the TJ. S. Fish Com- 

 mission, used for hatching eggs of the land-locked salmon. 

 (Looking northwest.) Size, 8 by 10 inches. Grand Lake Stream, 

 Me., 1882. (773) 2,231. TJ. S. Fish Commission. 



SCHOODIC HATCHING STATION. 



Photographic view of the principal buildings at the station of the 

 TJ. S. Fish Commission, where eggs of the land-locked salmon 

 are taken and hatched. (Looking southwest.) Size, 8 by 10 

 inches. Grand Lake Stream, Me., 1882. (774) 2,232. TJ. S. 

 Fish Commission. 



SCHOODIC HATCHING STATION. 



A general photographic view of the fish inclosures, spawning-house, 

 and watch-bouse at the TJ. S. Fish Commission hatchery. Size, 

 30 by 40 inches. Enlarged by electric light from an 8 by 10 

 negative. Grand Lake Stream, Me., 1882. (771) 2,229. TJ. S. 

 Fish Commission. 



