Zooplankton. Vertical hauls to collect zooplankton were 

 made by lowering a 25-centimeter silk plankton net to depths 

 as great as 200 meters and then hauling it back to the surface. 

 In this manner, 39 hauls were made from the USS HENDERSON 

 en route to and while in the antarctic; 19 hauls were made 

 from the USS CACOPAN. Also, numerous portions of bucket 

 samples of surface water and portions of the Nansen bottle 

 samples from various depths were preserved, primarily 

 for quantitative phytoplankton studies. The samples, which 

 were preserved in 4 per cent formalin, have been turned 

 over to the Scripps Institution of Oceanography, University 

 of California, for study and inclusion in their permanent 

 biological collections. 



No information is as yet available concerning the zoo- 

 plankton collected in the net hauls during Operation HIGH- 

 JUMP. However, one interesting observation that was made 

 from aboard the USS CURRITUCK is justifiably recorded 

 here. In the vicinity of the ice pack (latitude 64°S, longitude 

 130°E), personnel aboard the USS CURRITUCK reported that 

 an area of water, many acres in extent, was colored red by 

 a swarm of shrimp-like organisms about one inch in length. 

 Such a swarming of krill was not observed elsewhere. 



Bioluminescence . Bioluminescence (so-called phospho- 

 rescence) was noted almost continuously at night in both 

 tropical and subtropical waters but it was never strongly 

 developed. The brightest display was observed on the night 

 of 13 December 1946 in the tropical Pacific (latitude 22°S, 

 longitude 149°W). Not once was bioluminescence observed 

 in the antarctic, although frequent attempts were made to 

 observe the phenomenon during the latter part of the antarctic 

 summer when there were a considerable number of hours of 

 total darkness. 



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