Cruise 



C 9-0 1 



station 



(f^ri i^a 



■■l 



SHF 



^,'^8 



Total Larvae 



//7r 



Anchovy L. 



Sardine L. J. mackerel Pac. mackerel Hake 



Sebastodes Anchovy E. Sardine E. 



Saury E. 



7/9 



±3- 



72. C 



^99>-? 



«, c 



\5 jflftiftii/- I 



'?£'<i,5 





7, ? 



(■ 





Pa I . «^ * t <i. - I — S • » 

 Jc j.« ,^^ - / 0- i?. g 



W/ T^^i ?. 2f.c.r 



Figure 30. — Identifier's tabulation sheet (see text for description of form) — sample copy of sheet for station 80.52, 

 cruise 6801 (compare with plankton sorter's tabulation sheet and work sheet for the same station, Figures 26 and 

 27). On this form, the whole numbers are the identifier's counts for all species; their total is in the upper right hand 

 corner. No change is made on the sorter's master sheet (Fig. 29). Standardized numbers (the decimals) are ob- 

 tained by multiplying each species number by the standard haul factor (SHF — top line — obtained by standardization 

 of data; see text and Figure 37) and adding them for the standard total at bottom right of largest space. Proce- 

 dures used in automatic data processing of these identified species are described in the text and illustrated in part in 

 Figures 31 and 32. 



CURATING 



The general and reference collections are peri- 

 odically checked to assess the evaporation of pre- 

 servative from the vials. The screw-top lid with 

 the vinyl liner (Fig. 28, also see section on Plank- 

 ton Sorting) now used on our vials is virtually 

 evaporation-proof if well tightened when stored. 

 Occasionally some vials with loose caps may lose 

 liquid by evaporation in which case preservative 

 is added, the cap tightened properly, and the vial 

 stored again. 



Standardization 



During tows for plankton, different volumes 

 of water are strained through the net depending 

 on different speeds of the tow (more water with 

 high speed) or different times of tow (in shallow 

 versus standard depths). 



In order to make tows comparable, all hauls 

 are adjusted to a standard amount of water 

 strained per unit of depth fished — 10 m^ of water 

 strained per meter of depth fished. This value 

 is used because it gives a factor of approximately 



30 



