126 FISH HATCHERY MANAGEMENT 



Column 12: The sum of the entries in this column divided by the number 

 of entries gives the average Temperature Units (TU's) required per one 

 inch of growth to date. 



Column 13: The sum of the entries in this column divided by the number 

 of entries gives the average Temperature Units (TU's) to date. 



Column 14: The sum of the entries in this column divided by the number 

 of entries is the average length increase to date. 



Warmwater Pond Records 



Important recordkeeping information for warmwater fish pond manage- 

 ment is shown in Figure 42. Accurate historical data concerning fertiliza- 

 tion and pond weed control can be useful in evaluating the year's 

 production. 



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