Figure 31. — Sample sheet of code 

 numbers, for automatic data proces- 

 sing, assigned to the fishes of the 

 California Current region. Coding 

 was made on the basis of phyloge- 

 netic sequence of orders, families, 

 genera and species, and some com- 

 mon names. Some numbers were 

 left out in sequences to allow for 

 insertion of new finds or possible 

 name changes, some of which are il- 

 lustrated here. The list was con- 

 verted to alphabetical order to make 

 it easier for statistical personnel, 

 unfamiliar with phylogenetic se- 

 quence, to find and use the proper 

 numbers when assigning them to 

 the identifiers' sheet (see Fig. 32). 



1.0 for a net with a 1.0-m-diameter mouth open- 

 ing. A standard haul factor (standardization 

 factor) is derived for each haul by the following 

 formulation: 



S = 



10 D 



or 



10 D 



Rap 



where S = standardized haul factor (= SHF). 

 D = average depth of haul — derived by 

 multiplying the cosine of the aver- 

 age angle of stray by the length, in 

 meters, of the towing cable. (The 

 cosine of the average angle of spray, 

 derived from a tangent of all angles, 

 is considered more representative of 

 the haul as a whole than the cosine 



of the angle of stray at the greatest 

 depth.) 



V = total volume of water strained in 

 cubic meters. 



R = total number of revolutions of the 

 current meter during the tow. 



a = cross section area of mouth of net 

 in m.' 



p = length of the column of water, in 

 meters, needed to effect one revolu- 

 tion of the current meter at average 

 speed at which the haul was taken 

 (determined from the appropriate 

 calibration graph — see calibration 

 of flowmeters). 



31 



