29 



During the days of January 12 and 13, 1956, similar 

 voliunes of plankton were in the waters near the Hyperion out- 

 fall in Santa Monica Bay. The volumes did not equal those 

 along the Orange County coast except in the boil, but were 

 still 8-10 times that noted in Santa Monica Bay in the fall 

 months. Again the most abundant forms were the diatoms, 

 which averaged 66% of the total plankton, whereas the dino- 

 flagellate volume was 23%. The diatom Chaetoceros spo was 

 by far the most common, being 42% of the average haul. 

 Ceratiu m furca was again the most abundant dinof lagellate. 

 Of the zooplankton, nauplius larvae constituted 4% of the 

 population. 



These quantities of planktonic forms continued to be 

 present in the waters of the Los Angles area through Feb- 

 ruary, In this month on the 2nd, 3rd, and 12th, equivalent 

 volumes were recovered near the Whites Point outfall. As 

 before, the volume was greatest in the boil area, but remained 

 relatively high at distances of several thousand feet. Dia- 

 toms remained the most abundant group (60%), but on these 

 days and in this area, zooplankton were more common than the 

 dinoflagellates (Figure 10 \ Copepods represented 10% of 

 each haul and the Forarainifera Globigerina sp, was present, 

 averaging 47o of the total numbers. 



The plankton population was low in March and April and 

 the first part of May 1956, the volumes in net hauls being 

 similar to those obtained during October and November 1955. 

 In the latter part of May the numbers increased. Diatoms 

 composed 79% of each net haul, Chaetoceros sp. representing 



