THE OLDER STAGES 



203 



Table 43. Vertical net hauls. Monthly production of larvae in shelf and oceanic water compared, the 



total oceanic catch in roman type, the total shelf catch in italics 



First Second Meta- Calyptopes Furcilias 



Nauplii NaupUi nauplii , * v , * ^ No. of 



Month 1 2 3 123456 stations 



April — — — 4 55 72 11 25 g8 23 — — 14 



— — 1,867 954 1,740 1,162 514 527 98 33 22 8 36 



March — — 1 6 sg 205 43 — — — — — 8 



— 528 7,467 11,212 1,824 3.264 2,473 625 157 304 246 46 80 



Feb. 9 10 26 25 — — — — — — — — 49 



— 1,435 2,936 1,037 244 223 256 154 18 I — — 71 



Jan. 1 11 20 8 3 — — — — — — — 25 



— 347 96 60 19 IS 3 2 — — — — 43 



Dec. 2 4 ^ — — — — — — — — — 19 



— 13 9 16 I— ______ 25 



Nov. — 4 — — — — • — — — — — — 30 



— — — — — — __ — — — — 27 



Table 44. Vertical net hauls. Larval production in shelf and oceanic water compared, figures for shelf 



water in roman type, for oceanic zvater in italics. For further explanation see text 



Calyptopes Furcilias 



Depth First Second Meta- , ^ ^ , * ^ 



(m.) Eggs Nauplii Nauplii nauplii 123123456 



50-0 — — — — 67642111 — 



100-50 — — — — 9 3 9 S — — — — — 



250-100 — — — — 32 543 3 — — — — 



4— — __________ 



500-250 — — — — 5________ 



20 — — — — — — — — — — — — 



750-500 — — — 2^j — — — — — — — — 



1000-750 — — 3 22 — — — — — — — — — 



1500-1000 112 — 49 14 — — — — — — — — — 



The actual depth of hatching in oceanic water is still a matter for conjecture. It is clear, however 

 (p. 98), that it must be very deep, taking place normally far below the range of our deepest vertical 

 nets. Our repeated failure, except apparently once (p. 90, Table 13, Station 2594) to capture eggs 

 and Nauplii below 1000 m., in spite of systematic search covering the maximum possible extent of the 

 hatching period, November to April, leaves little doubt (p. 102) that it is at depths below 1500 m., 

 the bottom limit of our deepest observation, that the new-born krill make their earliest appearance. 

 Between 1500 and iooo m. we have rarely, it is true, struck larvae of any kind, and although it is 

 distinctly surprising that the Second Nauplius and Metanauplius at least (p. 90, Tables 13-15) have 

 so seldom been encountered there, I have little doubt that the answer to this is that we have hardly 

 if ever sampled this deep level thoroughly enough, in the right places, at the right time of year. We 

 have no deep hauls (below 1000 m.) for instance in Weddell West, where, in January and February 



