46 FISH CULTURE. 



we do. If they find anything unusual taking place, 

 they turn a stronger stream on, and that has often a 

 sanitary effect. 



I have not yet shown how these trays are to be 

 arranged. I cannot do tetter than call the atten- 

 tion of my readers to the engraving at page 47, which 

 will show the arrangement better than any words. 

 There should be a fall of from one to two inches or 

 more, if it can be conveniently spared, between each 

 tray. The water falls in at one end of the tray, 

 and out by a pipe near the end into the next ; then 

 travels to the other end of that tray, where it finds 

 a similar exit, as depicted, and so on throughout the 

 entire range. If it be more suitable to the space, 

 the spouts may be placed at the ends of the trays, 

 so as to run straight from end to end, the trays being 

 placed in a line. Or one end spout tray may run 

 into a side spout tray, and that into another end 

 spout, and that again into a reverse side spout, but 

 this is an inconvenient plan,. and I do not recommend 

 it. However the trays are placed, they should be 

 easily approachable, so that the operator can, without 

 the least difficulty or constrained position, get at 

 them to remove the dead ova or extract the live 

 fish. 



The supports of the trays depicted in the enora- 



