16 FISH CULTURE 



The shape of a fry-pond is immaterial, pro- 

 viding there are not many angles to prevent 

 quick and easy seining ; yet it is an economy to 

 have fry-ponds longer than their width, so that 

 they may be more easily seined, since the 

 method is to seine them lengthwise and not 

 across. 



Fry-ponds are to be located as close to the 

 breeding-ponds as possible, chiefly on account 

 of convenience in transferring, and close to- 

 gether, so that when sorting takes place the 

 different sizes of fish may be quickly changed 

 from one to another. If there be any consider- 

 able number they should be divided into groups, 

 each with a separate drainage system, and a 

 separate water-supply; for, as high tempera- 

 tures are necessary, such waters lose their 

 health-giving qualities very rapidly. 



As soon as possible ponds enough should be 

 built to have two complete sets for use in alter- 

 nate years, so that while one set is used the 

 other can be drawn entirely clear of water from 

 September until March. Two sets of ponds will 

 be found useful also because of the rapid 

 growth of aquatic plants, an essential feature 



