reusing the available nutrients, and with the variations in 

 temperature, light, predators, turbulence, etc., which exist. 

 The problems of determining the in situ requirements for plank- 

 ton reproduction are innumerable, and certainly unanswerable 

 at this time. Nevertheless, the relationship between the 

 available nutrients and plankton is unquestionable (Sverdrup, 

 Johnson, and Fleming, 1942). 



Methods 



Oceanographic 



On cruises to the Orange County, Hyperion, and Whites 

 Point outfalls during December 1955 and January and February 

 1956, two days in sequence were generally spent making vertical 

 profiles. Stations were occupied in the immediate vicinity of 

 the outfall and in the surrounding waters to determine to some 

 extent the areal distribution of the nutrient fields. The 

 enrichment of nutrients around the outfalls and their dimi- 

 nution with unit distance from the outfall were compared to 

 surrounding normal shelf water. 



Laboratory 



Standard chemical methods were used to determine the 

 concentrations of silicate-silicon, phosphate -phosphorus, 

 nitrate-nitrogen, ammonia-nitrogen, and dissolved oxygen. 



The silicate-silicon concentration was measured by the 

 Dienert and Wanderbulcke method as modified by Robinson and 

 Thompson (1948a) . The water samples were stored in poly- 

 ethylene bottles and the colorimetric comparison made two to 



