PROPAGATION AND DISTRIBUTION OF FOOD FISHES, 1922. 



99 



CANVAS JACKET FOR 10-GALLON CAN. 



The canvas jacket, designed by E. C. Fearnow and illustrated 

 in Figure 6, is found especially desirable when making shipments 

 of fish to distant points during Avarm weather. 



AERATING DEVICE. 



This new aerating device for use in transporting live fish (fig. 7) 

 was designed by M. A. Mason, engineer at the Cape Vincent (N. Y.) 

 station. It consists of a hollow cylinder made of galvanized sheet 

 iron 18 inches high by 6 inches in diameter. In the bottom are 28 

 one-half inch perforations from which fish are excluded by wire 

 mesh fastened to the inside surface. At the top is a handle and a 

 vent in the form of a |-inch brass pipe extending upward If inches. 



In use the cylinder is inserted in the can of fish with the vent open 

 and allowed to fill with water. The vent is then closed by the thumb 

 of the operator and the cylinder withdrawn to a height several 

 inches above the water level of the can. By opening the vent the 

 water in the cylinder falls back into the can through the perfora- 

 tions, much broken up, carrying the needed oxygen with it. 



Some of the advantages claimed for this device are that it removes 

 for aeration water from near the bottom of the can, whereas the 

 dipper in ordinary use takes mostly surface water. A larger amount 

 of water is aerated at one operation than is possible with the dipper, 

 and there is less chance of injury to the fish. 



COST OF DISTRIBUTION. 



During the fiscal year 1922 the bureau honored 10,376 applications 

 for fish as compared with approximately 10,000 in the fiscal year 

 1921. By the use of improved methods and the exercise of the most 

 rigid economy the distribution cost was slightly lowered. The fol- 

 lowing table gives comparative figures concerning cost of distribu- 

 tion for the fiscal years 1921 and 1922. 



