0 1 1 t Iw whole, the vwt i ( d (list ribution of t’eiist-idea is shiilloww
t I t i u i that of ( ‘itri(ka, t ~ i i d Sergestitlac ttre most intimately associated
witsh the i i p p r proclurtivtb zone. ‘I’hc predominant species of tht*
f~imily :Ejvrgcstidae belong riiost,ly to the first to third groups; those
of t h P(.ililc~idilt~ arc in thc third to fifth groups.
The shrinips of thv first, to third group8 and part of the fourth
groiip inigritt,Ck to the cliphot ic., productive zone und eat. whereas
t,hos(* of t h (\reper groups f k l oii orgariic remains twtl on hoth migrating and noii-rnigrttting itnitrials (kswnditig from the shitllow Iitvers.
\.’iriogri~dov ( 1961 ) c*onsitlrretl the I)ossil)lc 1uLthways by which organic
inatter coiild I)c ti-unsfiwwl fiuoni tlio surface to a b p a l dcpths of
8 000 r n iisiiig inigratory roirtc1.q. ’I‘hr tcntativc* whemc. presented
n\)ovr shows tlittt pelitgir shrimps to soinr rxterit produrr spatially
s i d i 11 “ Iiddc~r of rnigrntioris * ’ t i t Iwst in t h c s upper 1 000-m stratom.
C o i n p r i ~ o i i of the spwies totals for thcs whole collectinn shows
that in ptvicrtil l o w r mcsopc*lrtgic sp(~*ies of the third and fourth
groups tirv w n i m o n i ~ n d moHt iLbliiitltlnt in the oceanic watm-s, while
tliose of tlic fifth group arr not. This c4fwt, togethcr with the smallness
oi’ lnrli of t hP inigrntion of t)athypeIagi(~ popiilatio~i, results in a density
iniiiiinuni sotiitwhwe between 350 and 800 m depths at night.
diwnfhepAyrn qicndrispinoen is the most abundant speclies in
Sagimi I3ii.v. tint1 the total shrimp biomass attains the maximum in
400 600 m dcpth hy day and becomes minimum at the same depth at
night. as shown iii Fig. (i (Aizawa. 1969). The biomass transferred
lwtween the 0 400-m stratum and 400- 1 000-m stratum was about
t I t i u i that of ( ‘itri(ka, t ~ i i d Sergestitlac ttre most intimately associated
witsh the i i p p r proclurtivtb zone. ‘I’hc predominant species of tht*
f~imily :Ejvrgcstidae belong riiost,ly to the first to third groups; those
of t h P(.ililc~idilt~ arc in thc third to fifth groups.
The shrinips of thv first, to third group8 and part of the fourth
groiip inigritt,Ck to the cliphot ic., productive zone und eat. whereas
t,hos(* of t h (\reper groups f k l oii orgariic remains twtl on hoth migrating and noii-rnigrttting itnitrials (kswnditig from the shitllow Iitvers.
\.’iriogri~dov ( 1961 ) c*onsitlrretl the I)ossil)lc 1uLthways by which organic
inatter coiild I)c ti-unsfiwwl fiuoni tlio surface to a b p a l dcpths of
8 000 r n iisiiig inigratory roirtc1.q. ’I‘hr tcntativc* whemc. presented
n\)ovr shows tlittt pelitgir shrimps to soinr rxterit produrr spatially
s i d i 11 “ Iiddc~r of rnigrntioris * ’ t i t Iwst in t h c s upper 1 000-m stratom.
C o i n p r i ~ o i i of the spwies totals for thcs whole collectinn shows
that in ptvicrtil l o w r mcsopc*lrtgic sp(~*ies of the third and fourth
groups tirv w n i m o n i ~ n d moHt iLbliiitltlnt in the oceanic watm-s, while
tliose of tlic fifth group arr not. This c4fwt, togethcr with the smallness
oi’ lnrli of t hP inigrntion of t)athypeIagi(~ popiilatio~i, results in a density
iniiiiinuni sotiitwhwe between 350 and 800 m depths at night.
diwnfhepAyrn qicndrispinoen is the most abundant speclies in
Sagimi I3ii.v. tint1 the total shrimp biomass attains the maximum in
400 600 m dcpth hy day and becomes minimum at the same depth at
night. as shown iii Fig. (i (Aizawa. 1969). The biomass transferred
lwtween the 0 400-m stratum and 400- 1 000-m stratum was about