. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. z66 DISCOVERY REPORTS large numbers of S. gazellae. These are nets which have been towed at many stations at a depth of less than 5 m. below the surface. Fig. 20 shows the size and numbers of individuals taken in the 1 m. oblique nets at Station 461 (56°44' S. o° 23' W, ), a 24-hour station in Antarctic water, and it demonstrates that size increases with depth. The animals have been plotted on Fig. 20 by their length in mm. against the % OF TOTAL 20 JO. IOOO I500 J 300 4 OO 500 z 6OO I
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. z66 DISCOVERY REPORTS large numbers of S. gazellae. These are nets which have been towed at many stations at a depth of less than 5 m. below the surface. Fig. 20 shows the size and numbers of individuals taken in the 1 m. oblique nets at Station 461 (56°44' S. o° 23' W, ), a 24-hour station in Antarctic water, and it demonstrates that size increases with depth. The animals have been plotted on Fig. 20 by their length in mm. against the % OF TOTAL 20 JO. IOOO I500 J 300 4 OO 500 z 6OO I Q- UJ a 700 . .jt,'.v-MSj t at â vvtf ⢠» ⢠⢠â¢â¢ â¢/ ⢠⢠⢠tc >. /â¢â¢ 90 Fig. 19 10 20 30 iO 50 60 70 8C TOTAL LENGTH MM Fig. 20 Fig. 19. The vertical distribution of S. gazellae at 129 vertical stations: the numbers at each depth are represented as a percentage of the total for all depths. Fig. 20. The vertical distribution of S. gazellae at Station 461 showing the increase in size with depth. mean depth of each haul, the mean depth for a haul from 280 to 180 m. has been assumed to be 230 m. The scatter of the observations when plotted is considerable but, although there are a number of animals of the smaller size groups present in the deeper hauls, it must be noted that these were made with flights of oblique nets, and therefore the paying out of the nets must be halted from time to time for attachment of more nets; thus the deeper ones may have sampled shallow layers for short periods of time. As the small animals are present in the upper layers in large numbers, it is likely that many of the small animals in the deep hauls are due to this source of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute of Oceanographic Sciences (Great Britain); Na
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