AMATEUR FISH CULTURE 



be washed in some large vessel full of water in 

 the manner above described. When the water 

 is quite clear, and the ova clean, they may be 

 caught in mid- water as they are sinking either 

 in the hatching trays or in a cup. If caught 

 in a cup they should be transferred with great 

 care to the hatching trays, and spread out in a 

 single and somewhat spare layer. They must 

 on no account be poured into the trays from a 

 height. While under water well-eyed ova will 

 stand a good deal of gentle tumbling about, but 

 if dropped into the water from even a little 

 height the concussion is likely to kill them. 



Mr. Armistead recommends glass grills rather 

 than trays such as I have described, but I have 

 found the trays work very well, and they are 

 very simple and clean. Glass grills are, however, 

 very excellent, though they necessitate a some- 

 what greater initial outlay than do the per- 

 forated zinc trays. 



A German fish culturist has recently recom- 

 mended keeping a stock of fresh-water shrimps 

 (Gammarus pulex) in the hatching trays and 

 rearing boxes. He says that the shrimps eat 

 only the dead ova, and never touch the living 

 ones. They also eat any vegetable or animal 



36 



