A. TEMPERATURE CO AT 3m 



JULY 1976 



B. SALINITY (%o) AT 3m 



FISHERY BULLETIN; VOL 78, NO. 4 



C. CHLOROPHYLL (Relotive Units) AT 3m 



46' 



44° 



42 = 





128° 126° 124° !28° 126° 124° 128° 126' 



D. PLANKTON VOLUME (ml/IOOOm') E. Engroulis mordox EGGS (No./IOm^) F. Engroulis mordox LARVAE (No./IOm^) 



MP 



128° 



126' 



124' 



Figure 4. — Results from the July 1976 ichthyoplankton survey off Oregon and Washington: hydrography, plankton volume, Engraulis 

 mordox eggs and larvae. One chlorophyll unit is equivalent to 46.3 /xg coproporphyrin standard/1 or 6.14 /xg chlorophyll a/1. Mean 

 standard length of northern anchovy larvae on each transect is listed along the left margin of F. 



between the Nehalem River and Cape Perpetua 

 within the Columbia River plume. The largest egg 

 concentration, 5,777 under 10 m^ sea surface, was 

 one-third the highest concentration found in 1975. 

 Overall mean egg abundance was 642 and 291 



under 10 m^ sea surface in 1975 and 1976, and at 

 positive stations it was 2,645 and 886 under 10 m^. 

 In both years the egg distribution was bounded to 

 the south and offshore but not to the north, al- 

 though relatively few eggs were taken on the 



864 



