26 Trout Culture. 



else the fishes will be carried on to the stream 

 and killed, and their bodies will block the screen 

 and cause an overflow, thereby adding mate- 

 rially to the loss. 



The zinc or gauze must be very fine, with holes 

 no more than one-sixteenth or one thirty-second 

 of an inch, as the fry have a tendency to work 

 down stream, and will seek for any small aperture 

 through which they can wriggle themselves, and 

 will follow each other out in this manner if they 

 can only find a crevice, to an extent which, how- 

 ever creditable to their ingenuity, is a sad loss 

 to the breeder. Every care should therefore be 

 taken to prevent this, and all should be- made 

 perfectly secure before the water is turned on. 



High authorities state that fishes' eggs should 

 be covered over and hatched in the dark. 

 Light covers should therefore be provided, and 

 they should have a hole or slot in them to per- 

 mit the water to enter from the spout above. 



The lids and lead pipes should have two 



