160
THE BIOLOGY OF EUPHAUSIIDS
TABLE V. VERTICAL DISTRIBUTION OF SIZE GROUPS OF EUPHAUSIIDS
Meganyctiphanes norvegica AT STATION 4286 IN THE SKAGERRAK (Einarsson, 1945)
Metres of
Numbers caught
Percentage of haul
wire out
Juvenile
Adult
0-group
I-group
115
264
208
72
28
165
144
280
68
32
200
16
496
39
61
250
11
403
36
64
300
14
667
18
82
~~
~ ~ _ _ _
Euphausia krohnii: MEAN LENGTH (mm) OF ANIMALS CAUGHT AT DIFFERENT
DEPTHS IN THE WESTERN MEDITERRANEAN (Ruud, 1936)
Metres of wire out
Station
25
65
300
1000
2 000
~~~
~~~~
38"17'N, 4'11'E
11-52
11.81
13.31
-
13.25
38"52'N, 7"43'E
12.61
12.68
13.41
13.19
-
PERCENTAGE VERTICAL DISTRIBUTION OB SIZE CLASSES OF SEVERAL SPEUIES
(Ponomareva, 1959b)
~~
~
Species
Layer
6-11 mm 12-16 m m 17-22 m m >23 m m
Thysanoiissa longipes
0-50
(ordinary form)
50-100
100-500
T . longipes
0-50
(small form)
50-100
100-500
T . inermis
0-50
50-100
100-500
50-100
T . raschii
0-50
100-500
Euphausia pacijica
0-50
50-100
100-500
30
26
44
88
6
6
51
29
20
48
30
22
24
31
45
19
45
36
44
41
15
33
44
23
33
67
-
25
25
50
-
69
27
4
95
5
17
18
65
-
25
18
57
-
66
34
100
-