BATHYPELAGIC SQUID BATHYTEUTHIS 119 



at 950 m and the layer of low concentration is between 750 and 1500 

 m. Beneath the converg:ence the minimum oxygen value is 4.01 ml/L 

 at 2250 m and low concentrations extend from 1250 to 2600 m. The 

 oxygen minimum ascends to 1450 m at 56°S where the value is 3.71 

 ml/L, and the layer of low concentration lies between 1250 and 

 2700 m. 



The 51 captures plotted on the 75 °W sections were taken during 

 several EJtamn cruises that worked between 70° and 95° W; most 

 captures came from between 70° and 85°W. Cruise 10 accounted for 

 25 of the captures and the remaining catches were divided among 

 Cruises 4, 5, 9, 11, 13, and 15. 



Twenty-nine tows that where made at depths greater than 500 m 

 in t\\Q. same region were not successful in capturing B, abyssicola: 

 twenty-one of these were fished at depths between 500 and 1000 m, 

 three were made at depths greater than 3000 m, only three were from 

 the range of maximum abundance and two were from transitional 

 depths. Therefore, it can be concluded that nets set to fish in the 

 depth range between 1000 and 2500 m (maximum abundance range 

 between about 1200 and 2250 m) will have a 90% probability of 

 catching B. ahynsicola. 



The plots of captures in the Circumpolar Water Mass look fairly 

 even between 700 m and 2500 m. South of 55 °S a number of captures 

 was made around the 1° and 1.5° isotherms; five captures were just 

 below the 1° isotherm, ten captures were between the 1° and 1.5° 

 isotherms and five captures w^ere between the 1.5° and 2° isotherms 

 (three were very close to the 1.5° C line). A cluster of successful 

 captures lies at 2000-2500 m between 62° and 65°S; these seven tows 

 took 31 specimens. The fifteen tows at temperatures below 1.5° C 

 took 64 specimens, well above the average. Three tows are plotted 

 below 2500 m; these possibly came from somewhat shallower depths 

 where B. ahyss'wola is more abundant, perhaps from around 2000- 

 2250 m. 



Eleven points lie between 2° and 2.5° C. Two of the captures from 

 shallower water above the 2.5° isotherm had simultaneous tempera- 

 tures below 2.5° C; they came from longitudes where the 2.5° isotherm 

 lies at a shallower depth than at 75°W or where the convergence is a 

 few miles farther north. The shallowest capture in this temperature 

 range (2°-2.5° C) was just under 700 m at 66°S where the 2° isotherm 

 lies closer to the surface; the simultaneous temperature was 2.08° C. 

 The catch was comprised of seven specimens 39-61 mm in ML. The 

 three captures clustered around the 2.5° isotherm at 1100-1200 m 

 between 59° and 60°S in the convergence zone took ten specimens — 

 seven larvae and three juveniles. 



