quantitative hauls, both vertical and horizontal, were carried out and. 

 while the resulting data are difficult to compare with cur owKj, they do pro- 

 vide comparisons of plankton volumes and diy weights between Hav;aii and 

 other regions visited on the cruise (Graham 1941 i, Wilsozs 1942) o 



The inshore environment has received more recent attention.. 

 Edmondson (1937) did quantitative sampling in the shore waters of Oahu at 

 a number of stations visited repeatedly during the year September 1931 to 

 September 1932 » He concluded that the copepods were en important food 

 item in the reef and bay habitats j, since he found the most luxuriant growth 

 of coral and other sessile organisms as well as the largest numbers of pla'ck- 

 ton-feeding fishes in areas of greatest abundance of free-swimming copepods o 

 The University of Hawaii and the Division of Fish ar*d Game of the Territory 

 of Hawaii have in recent years made an intensive study of the early life 

 history of the nehu, one of t?ie important t'juia ba.it fishes occurring in 

 the Islandso A large nimber of quantitative plankton samples,, obtained 

 from the inshore waters of Oahu, have been examined for the eggs and larvae 

 of the fish under investigation (Tester 1951) o These collections have not 

 as yet been analyzed for other plankton constituents i, but they should pro- 

 vide suitable material for a study of variations in plankton composition 

 and abundance in the inshore waters and for comparison with the available 

 data from the offshore environment o 



We wish to express our appreciation to fellow staff members of 

 POFI and the officers and crews of the Hugh Mo Smith and the John Ro Ttonning 

 for their assistance in obtaining the plankton collections on which this re- 

 port is basedo Vife are indebted to Oo E„ Sette, Director of the Pacific 

 Oceanic Fishery Investigations, for his many helpful suggestions during the 

 examination of the data and the preparation of the reporto The hydrographic 

 data employed in this study were collected and prccessed under the super- 

 vision of Thomas So Austin and Towneend Crcriwello Mr, Tamotau Nakata pre- 

 pared the illustrations o 



SOURCE OF MA.TERIAL 



During the years 19b0^ 1951^ and 1952^ POFI vessv^ils collectoid 

 zooplankton on seven cruises in Hawaiian waters s 365 meter-net hauls were 

 obtained at 204 stations by the Uo So Fish and Wildlife Service vessels 

 Hugh Mo Smith g on cruises 4^ 6j, 10^ 12j, and 17^ and John Ro M anning s on 

 cruises 8 and 9o The approximate locations of the stations are shown in 

 figures 1 and 2„ More exact positions., together witJi dates j, depths of 

 hauling, and other pertinent data are given in tables 16 through 22 in 

 the appendixo The tim.e of haulingj, as given in these seven tables » is 

 local civil time for the Hawaiian area (Greenwich time / 10 hours) » 



The five cruises of the Hugh Mo Smith provide synoptic observa- 

 tions over the area from the island of Kauai on the west to the island 

 of Hawaii on the east and adjacent waters to about 100 miles offshore in 

 a north-south direction » On Cruise 8 of the John R. Manning , a line of 

 stations west of Oahu was visited weekly for four successive weeks o 

 Cruise 9 of the Manning was conducted in waters adjacent to Oahu for the 

 purpose of measuring the variance among repeated hauls at the same station 

 and other short-term variations in zooplankton abundance,, 



