Rearing. 75 



two difficulties to contend with. On the upper 

 side we have the head of water, which, even if 

 only of a few inches in height, will assuredly, 

 unless well checked as above advised, work its 

 way under the sole-plate and well up on the 

 other side, thus affording a free egress to the 

 fry, which, always on the look-out for an outlet, 

 will not be slow to take advantage of it. 



On the under side we have fish that are al- 

 ways alive to the advantages of a good shelter, 

 with a flow of water through it. They therefore 

 will work most assiduously to dig a hole under 

 the screen and hide there. These things must 

 be carefully attended to, or the loss of many 

 fish is a certainty. 



Having the place in order, whether tank, box, 

 or stream, the next thing is to catch the fry out 

 of the troughs, and, as they are by this time 

 wonderfully active, the glass tube is no longer 

 of any use, and is, accordingly, superseded by 

 a light hand-net. The frame of this, made of 



