HAICHERV REC^UIRLMENTS 



37 



Table 4. con tinued. 



ITEM 



HATCHERY 

 SYMBOL 



CRITERL\ 



Rearing facilities [continued) 



Type of soil T C 



Troughs 

 Type 



Screens 

 Arrangement 



Tanks 



Type and size 



Egg incubation 



Buildings 



General layout 



T C 



T C 



T 



T 



T 



W 



W 



W 

 W 



W 



w 



Effluent treatment T C W 



W 



General construction T C W 



Avoid rocky terrain or unstable soil conditions 

 such as swamps and bogs. Obtain subsoil 

 information during site investigations. Con- 

 duct test borings prior to selecting pond site. 

 Avoid rocky soil, gravel, limestone substrata, 

 or old stream beds. Seek solid ground rea- 

 sonably impervious to water for earthen 

 ponds. 



Fiberglass, metal, wood; rectangular, 

 14' X 14" X 8" deep or rectangular 



16' X 16" X 16" double, deep-type. 



Perforated metal. 



Double with individual supply and drains. If 

 used in series, allow fall between tanks of at 

 least 12 inches and an aisle between tanks. 



Circular 4-8 feet diameter, sloped 

 bottoms J inch per foot of radius; rectangu- 

 lar, 3'x3'x30' double arrangement. 



Perforated aluminum. 



Five per hour. 



For convenience, with sufficient aisle space for 

 handling and removing fish. 



Commercial incubators such as Heath or 

 equivalent recommended. Jar culture or 

 hatching boxes may be adaptable in some 

 instances. 



Provide settling basin of size and design that 

 will effectively settle out solids from used 

 water prior to its release from the hatchery 

 proper. 



Arrange buildings to expedite work, to present 

 a pleasing appearance, and to be compatible 

 with topography and approach routes. Con- 

 sideration of local architecture is desirable. 

 Provide adequate spacing between buildings 

 for fire control. 



Design for economical heating; steam or hot 

 water is preferred for large buildings. Avoid 

 condensation problems in the tank room by 

 providing adequate insulation, ventilation, 

 and heating. 



