92 . FISH CULTUEE. 



extending from the corner of the tray opposite 

 to the outlet, to some inches heyond the outlet 

 itself, so as to divide that part of the tray in 

 ■which the spout is entirely from the rest of the 

 tray. But the difficulty is to fix the zinc. In 

 wooden trays you can tack it, and the division is- 

 effectual, as the fish cannot get by. In slate trays 

 you might have a small slit sawed, down which the 

 zinc might be slid, the other end being jammed in 

 the angle of the tray ; but in crockery the difficulty 

 is considerable, and either a small sieve must be 

 immersed under each spout in which many fish are 

 daily killed; or the fish must be constantly fished 

 out and put back into their trays. But this can only 

 be done when the fish are all of one sort and of one 

 hatching. When they are of different species, or 

 there is much difference in their age, the difficulty 

 in keeping them apart, without separate ranges of 

 trays, is much increased. If the pisciculturist has 

 a good stream of fresh clear water at command, 

 all this is very much simplified. A wooden box 

 of white deal, well seasoned, half-full of gravely with 

 a good stream through it, and some large stones 

 scattered about for. the fish to burrow under, will 

 be all that is needed. Across the exits and entrances 

 to this a slab of perforated zinc can be nailed, and 



