156 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



CHLOROPHYLL 



IHOVINO AVERAGE or S DETCRHINATlONS) 



5 ■• 



juLV awwsT SEPTEMBEo ocroeER 



CHLOROPHYLL A Mg/L 

 CHLOROPHYLL B Ug/l 

 CHLOROPHYUl C MSPU/U 



HOVEMOt OeCXMEn JANUARY FEBRUARY UARCH 



1959 



Fir.rRE 2. — Average chlorophyll concentration of East Lagoon from station samples. 



G SPLENDENS 



(MOVINQ AVERAGE OF 5 DETERMINATIONS) 



I I I I 



II I I L 



JAN MAR MAY JUL SEP NOV JAN MAR MAY 

 1958 1959 



Figure 3. — Salinity of East Lagoon showing monthly 

 averages. 



Copper 



Twenty tons of ore were added to the lagoon 

 August 21, 1958. The effect of this addition on 

 the overall copper concentration based on the 

 average of station results is shown in figure 5. 

 A maximum of 0.14 Mg- at. Cu/1. was attained in 

 less than a week but was reduced to the low value 

 shown by the excessive tidal and drainage dilution 

 that accompanied hurricane "Ella". The low 



iLl 1 L_ 



NOV OEC JftN FEB MAR APR 



1956 1959 



_L^.„^ \ \ 1 



Fini'RE 4. — Gymnodinium splendens (average counts for 

 all stations). 



maximum of 0.14 ng. at. /I. indicated that a second 

 and larger addition would be necessary to obtain 

 a copper concentration lethal to G. Ireve. Accord- 

 ingly, on October 21 an additional 40 tons were 



