THE- HATCHING OF OVA. 79 



CHAPTEE IV. 



THE HATCHING OF OVA AND TREATMENT OF ALEVINS. 



We nmst now go back a little in our process. We 

 will suppose the ova safely taken and conveyed to 

 its destination. Suppose the trays all ready and 

 the water running. The eggs should be deposited 

 without loss of time, and, when once deposited, 

 disturbed as little as possible until the eye is 

 developed. Even in picking out the bad ova the 

 operator should disturb the surrounding ones as 

 little as possible. There are various plans in use 

 for the removal of dead ova. Some persons use a 

 sort of glass syphon. This was invented by the 

 French, t furnish a cut of it. The thumb is placed 

 on the top of the implement; the nozzle is then 

 plunged into the water and placed before the ova 

 or small fry it is desired to extract, and the thimib 

 being suddenly withdrawn, the ova is drawn up 

 into the body of the vessel and can be dropped out 

 at the thumb end if required, or examined in the 



