. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. io8 DISCOVERY REPORTS lengths are derived, in two of the three half-months, from larvae taken near South Georgia and in the third half-month from the South Shetland-South Sandwich area. The low figure for the first half of March is caused by the great numbers of Meta- nauplius and ist Calyptopis taken at stations just north of the South Shetlands in that half-month. But this indefinite division into a north and south area breaks down alto- gether in the second half of March and first half of Apr
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. io8 DISCOVERY REPORTS lengths are derived, in two of the three half-months, from larvae taken near South Georgia and in the third half-month from the South Shetland-South Sandwich area. The low figure for the first half of March is caused by the great numbers of Meta- nauplius and ist Calyptopis taken at stations just north of the South Shetlands in that half-month. But this indefinite division into a north and south area breaks down alto- gether in the second half of March and first half of April, where the contrasted results. Fig. 30. Graph showing average growth rate of Euphausia superba during the first fifteen months of larval life. of the two periods are both derived from larvae from the Bransfield Strait and South Sandwich Islands-Burdwood Bank Line. The growth curve can be divided into four parts: a low, gently increasing portion from November to March, a steeper portion between March and June, a part having little or no upward tendency between June and August, and a steeply ascending portion from August onwards. The first part of the curve coincides with the observed period of spawning. The average length of the larval krill population will be kept down by the constant addition of very small developmental forms; it is a period of production and growth. The second part extends from the end of the spawning period to the time when winter conditions become eflFective. During this period the average length is not aflFected by influx of very young. 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); National Institute of Oceanography of Great Britain; Great Britain. Colonial Office. Discovery Committee. London ; New York : Cambridge University Pre
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