66 FISH FARMING ! 



much. Do not, however, neglect this necessary renewal, or 

 one day your fish will escape, and ths painstaking of many 

 months will be rendered futile. 



Ascertain the very highest flood level and construct your 

 screens and sluices in accordance with the requirements of the 

 situation. As I have already pointed out, the great considera- 

 tion is the choice of position for your ponds or screened por- 

 tions of stream or river ; but when every care has been taken 

 in this connection there still remains to exercise some fore- 



FRY ENCLOSURES FORMED ON A BROOK. 



thought concerning the screens and sluices, or the whole of 

 your work may one day be submerged, if not actually washed 

 away. Carry all your work well above the highest point 

 reached by the biggest flood, and have ample room depth es- 

 pecially in your surplus water channels, and all should be 

 secure. Make sure that your screens are sufficiently large to 

 permit of the greatest possible push of water passing safely 

 through them. Keep your screens of uniform size, aoid always 

 have a few spare ones in stock of different size perforations. 

 The value of this advice cannot well be over-estimated. 



Having erected the screens and sluices after an approved 



