NUTRITION AND FEEDING 243 



MONIDS (BASED ON COHO SALMON) FED TWICE EACH DAY. GIVEN AS PERCENT BODY 

 AND WATER TEMPERATURE. (SOURCE; OREGON FISH AND WILDLIFE DEPARTMENT, 



Here, A/, equals the daily increase in length in inches, and L equals the 

 length in inches at the present time. 



To use this equation, an average monthly growth in inches is established 

 from previous years' records for the same temperature. The daily increase 

 in length is determined by dividing the average monthly growth by the 

 number of days in the month. The daily growth then can be used to pro- 

 ject fish size to any date needed. An expected feed conversion is obtained 

 from previous hatchery records or calculated from the caloric content of 

 the feed (see page 225). 



For example, on April 13, we have 210,000 fish on hand. Their feeding 

 rate was last established on April I, when fish were 20 pounds per 1,000 

 fish, or 3.68 inches. We need to adjust the feeding rate again, knowing 

 from past records that at this temperature the average length increase per 



