Eggs and Larvae of the Nehu — Tester 
333 
TABLE 8 
Number of Eggs and Larvae according to Haul Order (Direction), and Depth for Survey la in the 
Vicinity of Station 4 
HAUL 
DEPTH OF TOW 
number of eggs 
NUMBER OF LARVAE 
SURFACE 
DEEP 
SURFACE 
DEEP 
SURFACE 
DEEP 
feet 
feet 
I A 
1 
6 
165 f 
144 
- 
1 
IB 
2 
10 
70 
33 
- 
3 
IIA 
1 
6 
578 
507 
1 
1 
IIB 
2 
10 
26 
31 
- 
1 
Ill A 
1 
10 
359 
336 
- 
1 
IIIB.. 
2 
17 
94 
57 
- 
1 
IVA 
1 
10 
340 
282 
1 
1 
IVB 
2 
17 
50 
41 
1 
4 
Totals 
1,682 
1,431 
3 
13 
(replicate by haul order) interaction, i.e., 
variation other than that due to chance in the 
differences between A and B catches from 
replicate to replicate. Both the difference be- 
tween the catches in A and B hauls and the 
large RXH interaction can be most plausi- 
bly attributed to non-random horizontal dis- 
tribution of the eggs, as will be explained 
later. 
In Survey an attempt was made to cover 
the area in the vicinity of Stations 4 and 5 in 
a grid formation with one series of three sub- 
station hauls (I to III) spaced at intervals and 
following a general east- west direction, and a 
second series of three substation hauls (IV to 
VI) also spaced at intervals but following a 
general north-south direction. Each substa- 
tion was represented by an A and a B haul, 
and each haul included a surface and a deep 
sample. In the first series, the A hauls were 
easterly, against the wind, and the B hauls 
were westerly, with the wind. In the second 
series, the A hauls were southerly and the B 
hauls were northerly, both crosswise to the 
wind, as illustrated in Figure 3. Deviations 
from a rectangular grid pattern were necessary 
because of danger of snagging the deep net on 
intervening shallows. On one occasion (Haul 
IIA) the deep net struck the bottom and was 
torn; it was replaced by another identical net 
in later hauls. No adjustment was made to 
compensate for loss of plankton in this haul, 
but the error introduced will not materially 
affect the conclusions of either this section 
or the one which follows. It was estimated 
that the ship travelled 2,400 feet during A 
hauls and 3,000 feet during B hauls in the 
first series, and that it travelled 2,700 feet in 
both A and B hauls in the second series. The 
data for each of the 24 samples are given in 
Table 10, and the analysis of the data, after 
adjustment to a mean distance of 2,700 feet 
and transformation to logarithms, is given in 
Table 11. 
The adjusted egg catches are as follows: 
sub- 
series STATIONS A B 
surface 
deep 
surface 
deep 
1 
I 
89 
69 
88 
84 
II 
21 
6 
46 
44 
III 
3 
2 
17 
23 
2 
IV 
191 
133 
146 
124 
V 
120 
84 
141 
97 
VI 
58 
52 
53 
51 
TABLE 9 
Analysis of Variance of Egg Catches in Survey 
la ACCORDING TO Replicate Double Hauls, Haul 
Order (Direction), and Depth 
SOURCE OF 
VARIATION 
DEGREES OF 
FREEDOM 
SUM OF 
SQUARES 
MEAN 
SQUARE 
Replicates (R) 
3 
0.14504 
0.04835 
Haul order (H) 
1 
2.11768 
2.11768** 
Depth (D) 
1 
0.03796 
0.03796 
RXH 
3 
0.33144 
0.11048* 
RXD 
3 
0.02159 
0.00720 
HXD 
1 
0.00669 
0.00669 
RXHXD 
3 
0.02470 
0.00823 
* Significant. 
** Highly significant. 
