lOo In a preliminary sampling experiment no significant differences ia 

 zooplanlcton abundance were found between the coastal waters of wind= 

 ward and leeward Oahuj differences were found., however i, on both 

 sides of" the island among a series of stations extending from close 

 to the shoreline to 5 miles offshore o 



llo In only one of four cruises tested was there a significant correla- 

 tion between zooplankton volumes and temperatures at a depth of 10 

 meters « 



12„ No significant correlation was found between zooplankton volumes 

 and depth to the 70 isotherm for any of the four cruises testedo 



13 o During the late summer and fall of 1951 there were statistically 

 significant changes in teiqjerature at the 10-meter depth along a 

 north-south section just west of Oahu which were not accompanied by 

 any significant change in zooplankton concentrationo 



14o A comparison of zooplankton volumes and surface inorganic phosphate 

 showed no significant correlation for Smith cruise 12, but a highly 

 significant correlation for Smith crxiise l?o 



15e Correlations of zooplankton volume and dissolved oxygen as percent 

 saturation at the lO-meter and the iOO-raeter depths gave low 

 negative coefficients of no statistical signif icanceo 



16 o An examination of tsraperature^-salinit;^' relations indioatsid that 

 during July and October^ 1951;, the water surrouading the Hawaiiari 

 Islands yielded T-S curves characteristic of the "Ee^stera North 

 Pacific Central Water Ifesso" The change in zooplankton abiindanoe 

 between the summer and fall conditions in 1951 was therefc2?e not a 

 reflection of a change of water m8,sso 



i7o In view of the uniformity in the amount of ^^oplankton and in the 

 properties of the sea water forming its environment^ it is not 

 surprising that we found few instances of correlations with these 

 properties o The few significant correlations that did occur are 

 noteworthy^ however^ and suggest the idea that zooplankton and 

 these factors are not directly related but are all governed by some 

 as yet unexplained condition in the environment that is more funda- 

 mental and more variable than the temperature or the phosphate it- 

 self o 



18o During the period of observation the amount of zooplankton in 



Hawaiian waters was greater than in the North Equatorial Current- 

 south of the Islands, but distinctly less than that found near the 

 Equator from 5° No to 5° So latitude., Data from the Northern Hoi-" 

 iday Expedition of Scripps Institution of Oc^eanography and ocllabor^ 

 ating agencies provide evidence that zooplankton increases markedly 

 in abundance to the north and northeast of the Islands ^ reaching 

 concentrations at 50° to 60° No latitude several times those fouad 

 near Hawaii and in the rich zone near the Equatcro 



5?. 



