. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 342 bulletin: museum of comparative zoology. Sea, August, 1903. Most of the volumes per cubic meter given by Apstein are not for the whole column of water, but for parts of it only, as given by closing nets; to make them directly comparable with the Grampus hauls, the entire depth at each station must be taken into ac- count. When this is done, the average per cubic meter, for the North Sea, is about cc.; the average for the Gulf of Maine 1 cc. Copepods were much more numerous in the North Sea than
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 342 bulletin: museum of comparative zoology. Sea, August, 1903. Most of the volumes per cubic meter given by Apstein are not for the whole column of water, but for parts of it only, as given by closing nets; to make them directly comparable with the Grampus hauls, the entire depth at each station must be taken into ac- count. When this is done, the average per cubic meter, for the North Sea, is about cc.; the average for the Gulf of Maine 1 cc. Copepods were much more numerous in the North Sea than in the Gulf, the average of fourteen hauls in the Gulf of Maine in August, 1913, being about 66000 under each square meter of surface; the aver- age in the North Sea August, 1903, about 1,000,000 (Apstein, 1906; Johnstone, 1908). And although Calanus is present in large numbers in the Gulf, it was never found in such swarms as occur in the southern part of the Norwegian Sea, where a surface haul of five minutes dura- tion with a meter net may yield more than a litre of Calanus (Damas, 1905, p. 15). TABLE OF STATIONS, NETS USED, DEPTHS OF HAULS IN FATHOMS. Nets. A = Albatross 4 ft. net. B = 24 cm. net # 20 silk. C = 36 cm. net # 3 silk F = Young fish trawl. H = Helgoland net. S = Michael Sars 1 meter net. Q = Quantitative net. T = Otter Trawl. Italics indicate ''no ; Date Station Lat. Long. 1913 Depth Nets Depth of hauls 10057 42° 6' 69° 56' July 8 47 B. C. A. H. 0, 0, 15-0, 30-0. 10058 41° 47' 69° 10' " 8 90 B. H-. 0, 40-0. 10059 41° 06' 68° 42' " 9 30 B. C. H. 0, 0, 25-0. 10060 40° 41' 69° 33' " 9 27 B. C. S. Q. 0, 0, 20-0, 20-0. 10061 40° 69° 29' " 10 80 B. C. 0, 0, 30-0, 50-0. 10062 40° 29' 70° 29' " 10 41 A. 0, 0,15-0. 10063 40° 45' 71° 16' " 11 33 B. C. H. 0, 0, 25-0. 10064 39° 55' 71° 13' " 11 370 B. C. H. A. 0, 0, 25-0,175-0. 10065 40° 72° 06' " 12 45 B. C. H. T. 0, 0, 20-0, 45. 10066 40° 2
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