FISH ACCLIMATISATION. 405 



side of the box. The ova being placed all over the bottom of 

 the trays the water keeps it in a gentle motion, and any dirt that 

 may be in the water is either passed off with the water or else 

 settles at the bottom of the box, where it remains. Nothing 

 now requires to be done but to take out any of the ova that 

 may die. A week will often elapse without having to do this. 

 As soon as the young fish are hatched out, the envelopes of the 

 eggs commence floating about ; the latter must be taken out with 

 a small gauze net. Matters may now be left in statu quo for 

 about six weeks, as the fish keep themselves clean by constantly 

 swimming about, and if there is any dirt they rub it through 

 the holes in the bottom of the tray. 



The three great advantages pertaining to this plan are : 

 first, the apparatus cannot overflow; secondly, no fish can escape 

 or injure themselves ; and thirdly, no dirt can accumulate where 

 the ova or fish are. There is also another great advantage in 

 the system, which is that, as compared with all other plans, it 

 is very economical, simple in construction, and can be adapted 

 anywhere. 



BUK.GHLEY PARK : July 1884. 



