150
THE BIOLOGY OF EUPHAUSIIDS
TABLE IV. THE VERTICAL
Species reaching
Average
Dist. type M = migrates surface at nigh(
day depth
(8)
(WL)
Thysanopoda monacantha
T . tricuspidata
T . aequalis
T . aequalis
T . subaequalis
T . obtusifrons
T . acutifrons
Meganyctiphanes norvegica
Nyctiphanes couchii
N . simplex
Pseudeuphausia latifrons
Euphausia americana
E . krohnii
E . mutica
E. brevis
E . superba
E. frigida
E . pacijka
E . tenera
E. distinguenda
E. gibboides
E. hemigibba
E. triacantha
Thysanoessa longicaudata
T . gregaria
T . vicina
T . inermis
T . raschii
Nematoscelis megalops
N . tenella
N . microps
Nematobrachion boopis
Stylocheiron carinatum
S. carinat um
S . su.hmii
S. elongatum
S . longicorne
S . longicorne
S. abbreviatum
Mesopelagic
Coastal
Coastal
Mesopelagic
Mesopelagic
Mesopelagic
Mesopelagic
Meso pelagic
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M/probable
M
M
?
M
No/probable
No
No/slight
M
Below
S
S
S
Below
100
S
S
S
S
S
S
S
S
S
S
S
S
S
5.0
S
S
S
S
S
S
S
>loo(?)
400
Below
70( ?)
S
S
300
200
S
> 800-400
700-400
700-500
300-100
ca. 400
> 300
400-100
(200-10
200-100
80-50
700-500
400-10
900-700
300-250
400
100-10
500-250
400-200
500-300
500-1500(?)
400-200
600-400
500-250
400
100-50
200-50
500-300
800-600
800-600
300-100
95 80
95&45
500-300
195555
105*70
600-400
* Also see data of Brinton (1967) on p. 152 for these species and for Eupl~uusia recurvu, E. ezim
maximum.