CULTURE OF THE WHITE-FISH. 527 



Clark made additional experiments, and from the experience of the preceding year, having learned 

 the necessity of immediate attention to the White-fish eggs after they were placed in the troughs, 

 began the work of removing the nnimpregnated eggs within two or three days' time, and, giving 

 them close attention, during the season hatched out a much larger percentage of eggs. Mr. 

 Green, in 18G9, distributed a quantity of the White-fish spawn to numerous applicants who 

 responded to an advertisement offering it for distribution. Some packages of spawn from this 

 supply were sent by steamer to Mr. Frank Buckland, inspector of salmon fisheries for Great 

 Britain. In referring to the condition of the eggs on their arrival in London, he says, 'A good 

 proportion of the White-fish eggs were alive and well.' 



" Some temporary troughs were put up in Detroit, Michigan, and supplied with the ova, 

 under the direction of Mr. A. M. Compeau, Mr. J. P. Clark, Mr. George Clark, and Mr. James 

 Craig. 



"Experiments were again made by Mr. Green, Mr. Clark, and Mr. Wilmot, in 1870. More 

 than a million of ova were supplied by the liberality of Mr. J. P. Clark and George Clark, without 

 expense, from their ponds in Detroit Eiver. Mr. Green also made experiments in the breeding of 

 Salmon Trout and Lake Herring, with some success. 



"In 1871 these gentlemen just referred to, from Detroit and vicinity, failing to arouse the 

 interest of the State authorities in the matter of fish propagation to the extent they desired, fur- 

 nished Mr. N. W. Clark, of Clarkston, with the necessary funds for the erection of a building, 

 sixty-four feet in length by twenty in width, in which were put up twenty-six troughs, sixteen feet 

 long and one foot wide. The entire building was devoted to the hatching of White-fish, and the 

 number of eggs laid down estimated at about one million. The experience of the previous years 

 aided Mr. N. W. Clark to a most complete success, and by the 1st of April the fish began hatching, 

 and before the 13th of the month the troughs were swarming with young White-fishes. Between 

 the 20th and the 30th of April these were all distributed by Mr. Clark in a number of inland lakes 

 in Oakland County, Michigan, and into the Detroit River. Mr. Wilmot again procured about one- 

 half million of White-fish eggs, which were handled with improved success. 



"Mr. Green gave less space to white-fish eggs this season, and laid down large quantities of 

 salmon-trout ova, with the purpose of distributing the Trout in the inland waters of the State. 



"In 1872 an employe" of Mr. Green devised a new apparatus for hatching fish, that economized 

 space to a great extent and afforded him room for a large supply of both salmon-trout and white- 

 fish ova. Visiting his establishment in January last, we found them hatched out in large quan- 

 tities, and orders arriving daily for the fry, to stock the waters of inland lakes in all parts of the 

 State. Mr. Wilmot obtained a supply of white-fish spawn at Sandwich, on the Canadian side of 

 the Detroit River." 



The employe" of Mr. Green above referred to was a Mr. M. C. Holton, whose invention is thns 

 more fully described : 



"Instead of placing a single layer of eggs in a long, narrow trough, he has prepared a can or 

 box, of perhaps a foot square and several feet in height. This is filled with shallow trays of about 

 half an inch in depth, with wire-gauze bottoms, on which the eggs are placed, so that with twelve 

 trays, having a surface of one square foot each, he accommodates twelve times as many eggs as 

 by the ordinary method. The box is so arranged that a current of water is carried by a covered 

 pipe down the side of the can to the bottom and allowed to enter at that point. The current in 

 its overflow passes from the bottom to the top, and the water circulates freely over the eggs. This 

 arrangement has the additional advantage that once a clay, or oftener if necessary, the trays can 

 be taken out singly, and any diseased or defective eggs removed, thus improving the entire mass." 



