286 University of California Publications in Zoology |Vou.9 
TABLE 14 
Distribution of Calanus finmarchicus as shown by vertical closing nets 
Day | Night 
6-12 a.m., 4-6 p.m. | 2-6 a.m., 6-8 p.m. (below 50 f.) 
Depth in Hauls Animals | Hauls Animals 
fathoms Total Success. Total Perfathom Freq. | Total Success. Total Perfathom Freq. 
= B Cc D E r G H I J 
5-0 15 3 17 3.4 20 14 6 27 5.4 43 
10-5 15 5 32 6.4 3 |) ale! 5 49 29 36 
15-10 15 5 42 8.4 33 15 7 99 19.8 47 
20-15 15 4 21 4.2 27 || 45 8 75 15.0 53 
25-20 15 5 10 2.0 33 14 9 65 13.0 64 
30-25 17 7 20 4.0 ALS || ta 10 98 19.6 71 
40-380 14 7 40 4.0 50 || 14 12 52 5.2 86 
50-40 16 6 48 4.8 37 15 he, S4 8.4 80 
75-50 17 if 393 15.7 58 || 16 14 398 15.7 88 
100-75 6 4 143 5.7 66 3 3 240 9.6 66 
150-100 6 5 225 4.5 83 t 4 114 2.8 100 
200-150 6 6 242 4.9 100 3 3 $7 17 66 
250-200 6 6 22 4.4 100 1 0 0 0.0 0 
300-250 4 2 58 1.6 50 | 1 1 1 0.2 100 
This table shows that the region of greatest abundance during 
the day is between 50 and 75 fathoms (columns C and D, line 
9). It is to be noted, however, that the greatest frequencies 
are between 150 and 250 fathoms (column E, lines 12 and 13), 
where the animals were taken in each of twelve hauls. It 
seems to me that this is a case where one must endeavor to 
estimate on the basis both of the abundance and the frequency. 
During the night there appear to be two plurima, one at 
10-15 fathoms and one at 30-25 (eolumns H and I, lines 3 
and 6), but the abundance at 75-50 fathoms is close to the 
others. 
Neither the day nor the night plurimum with the vertical 
closing nets corresponds to those found with the horizontal 
closing net. The latter appears to encounter the animals most 
abundantly at about 200 fathoms during the day, while the 
plurimum between 6 and 10 p.m. is at 100 fathoms, at midnight 
between 5 and 10 fathoms and from 4 to 6 a.m. it is at 100 
fathoms again (Esterly, 1911b). 
