Table 1.--A list of the ships, cruises, and dates on which samples of zooplankton were collected 



Sampling series 



Ship 



Cruise 



Date 



Comprehens ive 

 Do 

 Do 

 Do 

 Do 



Monitor 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 



Inshore -offshore 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 

 Do 



Charles H. Gilbert 



do 



24 

 32 

 34 

 35 

 36 



29 

 32 

 30 

 30 



34 

 34 

 34 

 35 

 32 

 36 

 36 



29 



1 



2 

 30 



3 

 30 

 34 

 34 



5 

 34 



6 

 35 



7 

 32 



8 

 36 

 36 



9 

 10 



Nov. 14-18, 1955 

 Feb. 2-7, 1956 

 May 7-11, 1956 

 Aug. 1-6, 1956 

 Nov. 7-10, 1956 



Sampling Program 



The sampling comprised four series: 



1. The comprehensive series, to investigate 

 vertical, horizontal, seasonal, and diel 

 fluctuations in abundance of zooplankton. 

 Samples were taken simultaneously at 

 three levels (0-60, 70-130, and 140-200 

 m.). During one cruise, two kinds of tows 

 were made at alternate stations with a 

 single open net: between the surface and 

 top of the thermocline; and between the 

 surface and 200 m. 



2. The monitor series, to determine fluctu- 

 ations in abundance of zooplankton in wind- 

 ward and leeward areas off Oahu. Oblique 

 hauls were made with an open net between 

 and 60 m. 



The inshore-offshore series, to evaluate 

 littoral influences on abundance of zoo- 

 plankton. Oblique hauls were made with 

 an open net between and 60 m. 

 Oblique hauls between and 200 m., to 

 compare abundance of zooplankton with 

 that estimated from similar hauls from 

 previous years. 



Treatment of Samples 



Volumes of the samples of zooplankton were 

 measured in the laboratory by the displacement 

 method as described by King and Hida (1954, 

 1957). The samples from the comprehensive 

 series received the following additional treat- 

 ment: 



1. After volumes had been determined for 



