The six kinds of larvae Included in this report constituted over 59 percent of 

 the fish larvae obtained in plankton hauls during 1957 (text table 2), As in all 

 recent seasons, anchovy larvae were the most abundant kind In the survey area, 

 and hake larvae were second in abundance. The abundance ranking of the other 

 four kinds of larvae were as follows: fourth, rockfish larvae ( Sebastodes spp.); 

 sixth, jack mackerel larvae; eleventh, sardine larvae; and ei^teenth, Pacific 

 mackerel larvae. 



The abimdances (standard haul totals for the year)— of the twelve most common 

 kinds of larvae obtained in 1957 are compared with their contributions in 1956 and 



1955t 



1957 1956 1955 



Larvae 



Anchovy (Engraulis mordax) 

 Hake (Merlucclus productus) 

 Vinciguerria lucetia 

 Rockfish ( Sebastodes spp.) 

 Leuroglossus stilblus 

 Jack mackerel ( Trachurus 



symmetricus ) 

 Lampanyctus leucopsarus 

 Lampanyctus mexicanus 

 Citharlchthys spp. 

 Diogenichthys latematus 

 Sardine (Sardlnops caerulea) 

 Bathylagus wesethi 

 All others 



Total 493,549 408,140 359,155 



Monthly abimdances of the larvae of sardine, anchovy, jack mackerel. Pacific 

 mackerel, hake, and rockfish are summarized in text table 2. 



1/ The method of deriving standard haul counts, totals and factors lias been 

 described by Ahlstrom (1948). 



