BATHYPELAGIC SQUID BATHYTEUTHIS 



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2 4 6 8 10 12 



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Figure 68. — a, c, Total number of 3-meter IKMT tows (clear area) and number of 

 successful tows (hatched area) at 250-meter increments in the South Pacific (a) and 

 South Pacific Convergence (c) regions of the Antarctic Ocean, b, d, Percentages (clear 

 area) of the total number of 3-meter IKMT tows (hatched area) that captured Bathyteuthis 

 abyssicola at 250-meter increments in the South Pacific (b) and South Pacific Convergence 

 (d) regions of the Antarctic Ocean. 



were successful and averaged 4.85 specimens per total tow, a consider- 

 able increase over the area to the south. In the Drake Passage no cap- 

 tures were made in eight tows to less than 1000 m, whereas four of 

 seven tows at the same depths in the Drake Passage Convergence 

 caught B. abyssicola. No tows were made between 1000-1250 m in the 

 Drake Passage Convergence, but every tow (12) below 1250 m was suc- 

 cessful ; success was slightly less complete below 1250 m in the Drake 

 Passage (figs. 67a-d). Therefore, in the convergence zone the tows 

 were more successful and caught more specimens. The combined suc- 

 cess of the two Drake Passage areas was 66%. 



The South Pacific region produced 42 successful catches (65.6%) 

 from 64 tows. The average catch was 3.28 specimens per total tow. 

 Forty-three tows in the South Pacific Convergence yielded 30 successes 

 or 69.8% of the total for the region, only slightly higher than in the 



