and of the flowmeter in the frame without the 

 net indicated that the net strains about 95 

 percent of the water in its path at a speed of 

 9 kn. The tabulated volumes are displacement 

 volumes of the total catch minus tunicates, 

 siphonophores, and medusae. 



Bathythermograph (BT) observations 



Table 4 has been compiled from information 

 tabulated on BT prints by the BT Section of 

 Scripps Institution. It includes: surface tem- 

 perature; class of temperature-depth trace 

 (C, M, N, or P, according to U.S. Navy 

 Hydrographic Office criteria); and depth of 

 surface layer (SL), defined as depth from 

 surface to top of sharp negative temperature 

 gradient (or depth of maximum temperature if 

 there is a positive gradient). 



Surface current velocity and direction 

 (GEK) 



Table 5 lists all available measurements, 

 which were made with neutrally buoyant 

 cable. 



LITERATURE CITED 



BRANDHORST, WILHELM. 



1958. Thermocline topography, zooplankton 

 standing crop, and mechanisms of fer- 

 tilization in the eastern tropical Pacific. 

 Journal du Conseil Permanent Inter- 

 national pour l'Exploration de la Mer, 

 vol. 24, no. 1, p. 16-21. 



HOLMES, ROBERT W. , and MAURICE BLACK- 

 BURN. 



1960. Physical, chemical, and biological 

 observations in the eastern tropical 

 Pacific Ocean: SCOT Expedition, April- 

 June 1958. U.S. Fish and Wildlife Serv- 

 ice, Special Scientific Report — Fish- 

 eries 345, 106 p. 



KETCHUM, BOSTWICK H., NATHANIEL COR- 



WIN, and D. JEAN KEEN. 



1955. The significance of organic phos- 

 phorus determinations in ocean waters. 

 Deep-Sea Research, vol. 2, No. 3, 

 p. 172-181. 



STEEMANN NIELSEN, EINAR. 



1952. The use of radioactive carbon (C 14 ) 

 for measuring the organic production 

 of carbon in the sea. Journal du Conseil 

 Permanent International pour l'Explo- 

 ration de la Mer, vol. 18, no. 1, p. 

 117-140. 



STRICKLAND, JOHN D. H. 



1958. Standard methods of seawater anal- 

 yses, Vols. I, II. Fisheries Research 

 Board of Canada, Manuscript Report 

 Series (Oceanographic and Limnologi- 

 cal), no. 18, 143 p. and no. 19, 78 p. 



WOOSTER, WARREN S., and NORRIS W. 



RAKESTRAW. 



1951. The estimation of dissolved phosphate 

 in sea water. Journal of Marine Re- 

 search, vol. 10, no. 1, p. 91-100. 



10 



