CHEAP FIXTUEES FOR THE HATCHING OF SALMON. 9G5 



they arc hatched, according to the temperature of the water. It is better 

 to be too early than too late in this matter. For the young fish is well 

 able to take care of himself, and in fact will sometimes begin to feed some 

 days before the sack has entirely disappeared, while we know not how 

 serious may be the result of two or three days' hunger. To remove them 

 from the trough a scoop nearly as wide as the trough, made of a wooden 

 frame with a shallow bag of mosquito net attached, after the fashion of 

 Figure 15, will do good service. If the 

 troughs are raised above the floor of the 

 hatching-house the fish can also be drawn 

 out from the outlets with water into a pail. Fip. m. 



It is sometimes desirable to keep fish over night ready for an early 

 morning start on a journey. This can be accomplished by taking a long 

 box that nearly fits a hatching-trough, knocking out the €nds and supply- 

 ing their places with wire-cloth fine enough to hold the fish. When the 

 time comes to put them into the cans they can be poured in from the box. 

 When several cans are to be filled the fish for each may be put into a 

 separate box. 



14.— CONCLUSION. 



In conclusion it is urged upon every person attempting the management 

 of spawn and young fish that, however careful the construction of the houses 

 and fixtures, the necessity for constant watchfulness is not to be escaped. 

 There is no insurance so good as frequent and careful inspection. Especially 

 in case of a severe storm or uncommonly cold weather, the attendant should 

 be on the alert early enough to watch for the coming of danger and avert 

 it. Nothing must be taken for granted until the establishment has demon- 

 strated its security. Experience will show how far vigilance can afterward 

 be safely relaxed. 



Another matter that cannot be too strongly urged upon the attention of 

 fish-culturists is the importance of complete records of all occurrences at the 

 hatching-house. Not only the receipts of spawn and its condition, the 

 losses occurring from day to day, and the shipment of young fish should be 

 promptly, fully, and carefully entered upon the record-book, but the tem- 

 perature of the air, the temperature, volume, and condition of the water 

 should be regularly observed and recorded, and occasional notes made 

 regarding the hatching and behavior of the fish, the presence and progress 

 of maladies, if any occur, and any other phenomena of importance or 

 interest. In no other way can the results of experience be so well pre- 

 served and made available, and it is much to be regretted that it has not 

 been the practice of all fish-culturists to keep such records. 



