120 FISH FARMING : 



realised if the hatchery is fed from a rock or ground spring, 

 and should there be one oil the estate that is tho very best site 

 for the hatching house; and, having ascertained beyond any 

 doubt that the spring is really pure and never failing, you 

 may proceed to erect the building, or to properly equip any 

 suitable structure that may already exist, without anv further 

 trouble, the water being merely conveyed to the hatchery 

 direct. 



Or you may obtain the supply of water from a. stream or 



PART OF A COMMERCIAL HATCHERY. 



river of known purity ; but in this case it generally becomes 

 advisable to pass the water through a, settling bed before it 

 enters the hatchery even though filter beds may be erected 

 in the hatchery or otherwise trouble may arise from sedi- 

 ment in flood time. A good position to " tap " a. stream is at 

 a fall or cascade, or immediately below it, as ait such a point 

 the water is, of course, well charged with oxygen. In some 

 fortunate case the water supply may be drawn from a hill- 

 side stream of excellent quality water, and) it only becomes 

 necessary to conduct such water supply tot the hatchery direct. 



