[91] FISHERIES OF THE UNITED STATES. 1245 



Work at central hatching station — Continued. 



ing-jars, while still another is dipping young shad into a can for 

 shipment. Size, 30 by 40 inches. Enlarged by electric light 

 from an 8 by 10 negative. Washington, D. C, 1882. 2,239. 

 U. S. Fish Commission. 



Seining carp. 



Photograph of employes of the U. S. Fish Commission removing 

 the fish from the Government carp ponds for stocking inland 

 waters. The ponds are made lower at one end than at the 

 other, and have several deep trenches, leading into a small res- 

 ervoir, where the fish collect, and can be readily taken after the 

 water has been drawn off from the ponds. Size, 30 by 40 

 inches. Enlarged by electric light from an 8 by 10 negative. 

 Washington, D. C, 1882. 2,243. U. S. Fish Commission. 



Sorting and counting carp. 



Photograph showing men at work separating the several varieties 

 of small carp and removing the minnows that chance to be 

 found among them. The men are obliged to ascertain the 

 number of each variety of carp while sorting. Size, 30 by 40 

 inches. Enlarged by electric light from an 8 by 10 negative. 

 Washington, D. C, 1882. (626) 2,130. U. S. Fish Commission. 



VII. — Results of ftsh-cultuee. 



10. Collections illustrating the growth of fish. 



eggs showing the growth of the embryos. 



Atlantic salmon. — ISahno salar, Linn. 



Ova. Prepared at the IT. S. Salmon- Breeding Station at Bucks- 

 port, Me. Charles G. Atkins, superintendent. A series of 

 eggs in alcohol, showing daily development of the embryo 

 for one hundred and eighteen days, beginning with the unim- 

 pregnated egg. 



Brook trout. — Salvelinus fontinalis (Mitchill), Gill & Jordan. 



Ova. Eggs taken from the U. S. Fish Commission trout ponds at 

 Northville, Mich., and shipped to the central hatching station 

 at Washington, D. C, where the series was prepared. U. S. 

 - Fish Commission. A series of eggs in glycerine, showing 

 the development of the embryo at regular intervals of two 

 days from a month after the impregnation of the egg to the 

 time of hatching, covering a period of fifty days. 



Whitefish. — Coregonas clupeiformis (Mitch.) Milner. 



Ova. Eggs taken in Lake Erie, near Detroit, Mich., and shipped to 

 central hatching station, Washington, D. C, where the series 



