118 IISII HATCHERY MANAGEMENT 



and feed projections from the time fry become large enough to be handled 

 and measured without damage. 



The following definitions and instructions relate to the Lot History Pro- 

 duction form used in National Fish Hatcheries (Figure 40). 



DEFINITIONS 



Date of initial feeding: This is the day the majority of fry accept feed or, in 

 the case of fish transferred in, the day the lot is put on feed. 



Number at initial feeding: If lots are inventoried at initial feeding, this 

 number will be used. If lots are not inventoried, the number of eggs re- 

 ceived or put down for hatching, minus the number of egg or fish deaths 

 recorded prior to initial feeding, will determine the number on hand at ini- 

 tial feeding. 



Weight at initial feeding: The weight on hand at initial feeding should be 

 recorded by inventory when possible. Otherwise, multiply the number at 

 initial feeding, in thousands, by the weight per thousand: (thousands on 

 hand) x (weight/1,000 fish) = weight on hand. 



Length at initial feeding: The length of fish at initial feeding, in inches, 

 can be found from the appropriate length-weight table in Appendix I cor- 

 responding to the size (weight per 1,000 fish). 



Size at initial feeding: For this chart, sizes of fish will be recorded as 

 weight in pounds per 1,000 fish (Wt/M). When sample counts are not 

 available, the size at initial feeding can be determined from Table 16. 



INSTRUCTIONS 



Column 1: Record the number of fish on hand the last day of the month. 

 This is the number of fish in Column 1 of the previous month's chart, 

 minus the current month's mortality (Column 4), minus the number of fish 

 shipped out during the current month (Column 5), plus the additions for 

 the current month (Column 7). This figure may be adjusted when the lot is 

 inventoried. Report in 1,000's to three significant figures, i.e., 269, 200, 

 87.8, etc. 



Column 2: Record the inventory weight of the lot on the last day of the 

 current month. When inventory figures are not available, the number on 

 hand the last day of the current month (Column l), multiplied by the sam- 

 ple count size (Column 3), equals the weight on hand at the end of the 

 current month. 



Column 3: Record the size of the fish on hand the last day of the current 

 month as determined by sample counts. 



Weight offish in sample , ^_,. x.r . , /, ^^^ r. i 



— — ^ ^ — X 1,000 = Weight/ 1,000 fish 



Number of fish in sample 



Column 4: Record the total deaths of feeding fish in the lot for the 

 current month. 



