BATHYPELAGIC SQUID BATHYTEUTHIS 125 



m represent the shallowest captures that are recorded for B. abyssi- 

 cola in the Antarctic ; each had one specimen and was in water between 

 1.5°-2.5° C. 



Four captures on the salinity section were in salinities less than 

 34.60%o. Of the remaining 15 tows 13 were at or ^rreater than 34.70%o 

 and 9 of these were in the layer of maximum salinity, 34.73-34.74%o. 

 Five captures were in densities less than sigma-t= 27.75; the other 

 14 were betw^een 27.75 and 27.85, corresponding to the high salinity 

 and low temperature. The two shallowest captures were in high oxy- 

 gen concentrations (greater than 5.00 ml/L), while the rest were in 

 or below the oxygen minimum layer at concentrations that ranged 

 from 4.25 to 4.75 ml/L. 



In summary, all captures of B. ahyssicola were made in tempera- 

 tures from just below 1.5° C to less than 2.5° C. Between 1000-2500 

 m, 13 tows captured 81 specimens in water slightly warmer than 2° C 

 to slightly cooler than 1.5° C. Six tows shallower than 900 m captured 

 only seven specimens in temperatures greater than 1.5° C and less 

 than 2.5° C. Nine tows with 55 specimens were in the core of high 

 salinity (34.73%o and 34.74%o). Only four tows, with one specimen 

 each, were below the 34.60%o isohaline. Most tows and specimens were 

 in high densities (above sigma-t = 27.75) and in minimum to moderate 

 oxygen concentrations (4.25 ml/L to 4.75 ml/L). All of the captures 

 are within the Antarctic Circumpolar Water Mass. 



130° West Longitude; 50** to 66** South Latitudes 



The sections for 130°W transect the western-central Pacific- Antarc- 

 tic Basin in the south and the Pacific- Antarctic Ridge in the north. The 

 oceanographic data were collected during Austral midwinter and the 

 Antarctic Convergence is located between 57°30' and 58°30'S. The area 

 is on the down-slope eastern side of the Pacific- Antarctic Ridge where 

 the main stream of the Antarctic Circumpolar Current is deflected 

 southward. 



The temperature section reveals a relatively uncomplicated tem,per- 

 ature structure (fig. 33) . The steepest isotherm is the 2° C isotherm that 

 ascends from 2750 m at 50°S to the surface at 5D°30'S. The 2° isotherm 

 exhibits no pronounced southward extension as it does farther east; 

 it rises nearly vertically from 1000 m to the convergence zone at the 

 surface. Water between 1.5° and 2° C protrudes well to the south 

 (66°30'S) as a broad tongue between 250 and 1150 m. The 2.5° isotherm 

 slopes from {ho. surface in the convergence zone to 1800 m at 50°S. 



The salinity section is dominated by the large segment of high-sa- 

 linity water that lies below the 34.70%o isohaline (fig. 34) . This line lies 

 at 500 m at 65°30'S and descends in a moderate slope to 1600 m at 55°S. 



