34 fish hatchery management 



Table 4. suggested standards for fish hatchery development, these 

 standards will change as new construction materials and more effi- 

 cient designs become available. hatchery symbol: t = trcjut and salmon 

 (cold water); c = cool water; w = warm water 



HATCHERY 

 ITEM SYMBOL CRIIERI.\ 



Land 



Area required Y C W Enough for facilities, protection of water su[j- 



ply, and future expansion; treatment ol 

 effluent; future water reuse and recirculation 

 systems. 



Topography V C W Sufficient elevation between water source and 



production facilities for aeration and gravity 

 flow. Land should have gentle slopes or 

 moderate relief that can be graded to pro- 

 vide adequate drainage. Avoid areas subject 

 to flooding. 

 Water supply 



Source T C 1 he water supply should be considered in this 



order of preference: spring; well; stream; 

 river; lake or reservoir. An underground 

 water source should be investigated. 

 W Lake or reservoir water preferred over creek or 



stream supply. 



Qj/aiility T C Water requirements are dictated by the size 



future of the unit planned. The supply 

 should provide A changes per hour through 

 each unit and no less than 1 change per 

 hour through the entire system. Where 

 water reconditioning is planned, require- 

 ments should be adjusted to the capabilities 

 of the system. Weirs or water meters should 

 be installed to measure total inflow. Allow 

 for future expansion. Prospective sources 

 should undergo long-term chemical analysis 

 and biological or live fish tests, with 

 emphasis on periods of destratification when 

 reservoir or lake supply is contemplated. 

 Studies should include examination of 

 watershed for potential sources of pollution 

 including turbidity. Consider equipment to 

 filter and sterilize water. 

 W Dependent upon acreage involved and require- 



ments. 



Temperature T 45-f)5°F for fish, 4.')-,'J,')°F for eggs. Plan equip- 



ment to cool or heat water to temperature 

 desired. 

 C fi()~7()°F desirable for walleye and northern 



pike culture. 

 W 70-8()°F preferred during growing season. 



