0 50
50 1 0 0
I00 300
P O 0 A 0 0
500 1 000
I 000 2 000
2 000 4 000
4 000 -6 000
> 0 000
On the other hand, Sergestes sirnilis occurs near the surface at
night between 60"N and 42'N in the mid-North Pacific, but it is
restricted to below 270 ni in Sagami Bay (35"N) where warm Kuroshio
water occupies ths upper layers. At all localities the temperatures at
the d c p t h of orcnrrenee were between 3" and 13"C, and the peak
iLblitidanc(* of t l l i t b x p w i w tit, night ocwirrctl at i t bout, the depth of the
fi 10°C i w t hcriiis i t 1 siitittncr (Oiriori o/ nl., 1972) Similarly, four species
of' tht. g~iriis rlc'rti,fh,qd~gm in ttw eustmw North Atlantic between 6O"N
iLlld I I "N ocwri*ctl in depth ri\ngw that wen' associattd with geogr;~phic*iiI gridicwts of tcinperrtt i i r ~ iir t h mcqxlagic zone (Foxton,
1 972b). Hpnl)iaogcrLncJrnrc~ horcdix is iL typicul batjhypelagio species
living mostly b c h v 700 m i n ttliv twnpcratc. North Yac4fic, but it
owurs abrriiduiitly iri thc. incvwpdrb#ic* %oii(' i t 1 Hubarctic! rc!gionR.
Figiirv 3 stiowx the vcarticvrl rnigrstioa of 8eryic.i lurrm tog(1thc.r
with profiles of t,c~inpcriitiirc~ a t i d Hdiriitg i ~ h v e 300 III in Srrriiga Bay.
k'rotn the (ttttii prwcntd here. it car1 he wen that the dopw of isohdint:
iLnd isothern~al surfaces are g c n r d l y parallel and that vausativr,
rchtionships ~ L I V difficult to ~ ~ S S C H S . However, the species appeared t(J
be uneble to pnsx the salinity gradient of 0.4%,, or more over a 10-m
depth intcwul. l h s e (1964) noted, in this connection, that attention
xhoulcl bc. piid to stratification, particularly of salinity, with regard to
tliv verticid inovtlment of zooplankton. Other observations showed
thtit the shrini 1) populatioii decreased where low oxygen values prevailed within tlie upper I 000-m of the western North Pacific (Aizawa.
1!)6X). 'L'hix sngpcxta that certain fipecies ucrc restricted to the water
layera abovtb that depth.
50 1 0 0
I00 300
P O 0 A 0 0
500 1 000
I 000 2 000
2 000 4 000
4 000 -6 000
> 0 000
On the other hand, Sergestes sirnilis occurs near the surface at
night between 60"N and 42'N in the mid-North Pacific, but it is
restricted to below 270 ni in Sagami Bay (35"N) where warm Kuroshio
water occupies ths upper layers. At all localities the temperatures at
the d c p t h of orcnrrenee were between 3" and 13"C, and the peak
iLblitidanc(* of t l l i t b x p w i w tit, night ocwirrctl at i t bout, the depth of the
fi 10°C i w t hcriiis i t 1 siitittncr (Oiriori o/ nl., 1972) Similarly, four species
of' tht. g~iriis rlc'rti,fh,qd~gm in ttw eustmw North Atlantic between 6O"N
iLlld I I "N ocwri*ctl in depth ri\ngw that wen' associattd with geogr;~phic*iiI gridicwts of tcinperrtt i i r ~ iir t h mcqxlagic zone (Foxton,
1 972b). Hpnl)iaogcrLncJrnrc~ horcdix is iL typicul batjhypelagio species
living mostly b c h v 700 m i n ttliv twnpcratc. North Yac4fic, but it
owurs abrriiduiitly iri thc. incvwpdrb#ic* %oii(' i t 1 Hubarctic! rc!gionR.
Figiirv 3 stiowx the vcarticvrl rnigrstioa of 8eryic.i lurrm tog(1thc.r
with profiles of t,c~inpcriitiirc~ a t i d Hdiriitg i ~ h v e 300 III in Srrriiga Bay.
k'rotn the (ttttii prwcntd here. it car1 he wen that the dopw of isohdint:
iLnd isothern~al surfaces are g c n r d l y parallel and that vausativr,
rchtionships ~ L I V difficult to ~ ~ S S C H S . However, the species appeared t(J
be uneble to pnsx the salinity gradient of 0.4%,, or more over a 10-m
depth intcwul. l h s e (1964) noted, in this connection, that attention
xhoulcl bc. piid to stratification, particularly of salinity, with regard to
tliv verticid inovtlment of zooplankton. Other observations showed
thtit the shrini 1) populatioii decreased where low oxygen values prevailed within tlie upper I 000-m of the western North Pacific (Aizawa.
1!)6X). 'L'hix sngpcxta that certain fipecies ucrc restricted to the water
layera abovtb that depth.