Titcomb. — Some Fish-Cultural Notes 203 



another hatchery shown in section B which on April 13th, nearly 

 two weeks later, range from 1 3-16 to 1 5-16 inches in length. 

 The smaller fish cost more than the larger ones, the eggs at both 

 hatcheries having been laid down about the same date. A com- 

 parison of the sizes of fish on dififerent dates in section A with 

 sections C and D, shows that the same situation exists. 



In some water supplies there is a rapid growth late in the 

 summer, which compensates for slow growth earlier in the 

 season, this, of course, being possible only in instances where 

 the fish are not distributed until late in the season. The weight 

 of fish of a given length differs under varying conditions. This 

 may be due to feeding methods or to the kind of food used. 

 The specimens and data herein referred to may suggest further 

 inquiry on this subject with a view to determining whether the 

 difference is due to water supply, or to feeding methods which 

 can be remedied. 



It is recognized that most fish culturists must accept condi- 

 tions as they find them, and that each hatchery has its individual 

 problems as to water supply and other matters, but it is strongly 

 recommended to those who have charge of a number of hatch- 

 eries that they collect specimens and compile data along the line 

 shown in the foregoing table. This will enable the study of 

 certain economic problems from a new point of view. 



If called upon to locate a new hatchery, the specimens and re- 

 sultant data may serve to forcefully show, merely by compar- 

 ison of water temperatures, the suitability or unsuitability of 

 some site under consideration. Although generally recognized 

 by fish culturists, it seems desirable to add here that no con- 

 siderable investment should be made in hatchery construction 

 until the water has been thoroughly tested with eggs and fish 

 and until a year's record of water temperature is available. 



POND CULTURE IN ABANDONED SECTIONS OF CANALS 



Some of you have heard about the efforts of the New York 

 State Conservation Commission to utilize abandoned portions 



