MANUAL OF FISH-CULTURE. 



149 



HATCHERIES AND EQUIPMENT. 



The buildiug" for a sliad-liatcliery maybe of a temporary character, as 

 it is used only about two mouths each year, but ample light, space, 

 ventilation, and arrangements for moderate heating are necessary. The 

 steam boiler and i)umj)s should be in a sej)arate structure. 



In exceptional cases, as at Central Station, in Washington, river 

 water from city pipes can be utilized. If the water supply is taken 

 directly from the river the suction should be put below low-water mark, 

 and the end provided with a strainer and kej)t ofit' the bottom to avoid 

 sediment. The water should be supplied from an open tank, not by a 

 force-i)ump, but if it is taken from municipal pipes a regulator may be 

 employed. A fall of 16 feet is desirable, or 8 pouii ds pressure per square 

 inch at the top of the hatching-jars. The amount required is 2 quarts 

 per minute to each jar. 



TTl)per figure showing view from 

 above. 



Lower left-hand figure: End view 

 .showing liatching-jar in position. 



Lower right-hand figure: Cro.ss- 

 sectiou showing tlie drain -pipe and 

 troughjn center of table. 



mam • wss. 



^ 



Shad-Latching table. 



The jars are arranged on tables, as shown in the cut. From a large 

 iron pipe, branch piping of li to 2 inches diameter is run over each 

 table, where ^-inch brass pet-cocks are inserted 6 inches apart. The 

 jars are connected with the sui)ply-i3ij)es by half- inch rubber tubing. 

 Tight drains are required to carry away the waste water. Collector- 

 tanks for fry are rectangular and may be of glass or wood, the former 

 j)ossibly i>referred. 



