0
200
800
10
100
Night‘
(2100) \
I
0 10 20 30 40 50
1000 -I
L 1000
b’ic:. 7. Vcrt,ical tlist,rit)ut,ior) of pdayic Hhrimp t i f f Canary Tsltmtl. A, tht: variation of
Day and night totals in numbetw rmr haul (log scale).
Day and night totals in g per
C:. tho vuristion in the numbor of speaies per haul (after Foxton,
t,ot,ul catch with depth.
13, thtr variation of d~capod t)iom&Ys with depth.
two-hour tow,
I970b).
v(hllowtii1 roc.ltfinlr Sdmstos (as S~b(itstodvs) , j h k . l u s (Ayres) off IYad1ingt#oti (1’cbreyr:L ct ctl., I Wu). Nwvia Zuwns is ciaten by tlit: gurnnrtl
/,c~pidntri!~lrt nic*lnptorr~ (:iitit,hct* i t i SitrlrgiL 1Jt~y (Kosake at al.. 1969).
‘ I ’ l i w ~ tl:Lt,iL siiggwi that thry dcsc~~nd to t h c vicinity of t hcA sea-floor
I)y tliiy ill piLrticwliLr loculit ies w i t 1 s(wm~s. Pci*c~yra et at?. (1969) suggt‘stttd that tlw prtwditig wrrcwl t raiisport ctl i I i r vertical migrating
iitiiinnls cluihg the iiight to t h c t’tlgi’ of thr cwiyon where the depth
w i n sli~.llowc~r than their iisiitll chytinicb rcBxitlenc-c tlcpth and they thus
! ) t w i t n c l coticrmtretc~tl a t or near tht. bottoni \vhrre they might be more
avtdiibltl t o thc. predtitory spwirs. Omori ( 1 9fi9a) found that the
vtlrticul (listrihittioii of S ’ c y i ~ Zitcc>ns is nioct’ intirriutely associated with
t 1w bottoni i n withbr tnonths. ‘rhe diurnal migration of the species is
intitit- obliquely betwcw the offshore. deep layers and thc inshore,
slidlow Isycw (Fig. 8). As tlie speciel;; xcatters widely between 150 and
:350 ni by (lay rmrl is often abundant from 3 4 to 10 m above t h e bottom
t1t’ilt’ thct stcep cwtitinentiil slope, they can be eaten. even in the other
s(!iiHOIIs, by pelagic fish living close to the sea-floor.
rt8 is siiggcst,ctl that the diiirnal vertical migration of Lucijer fanmi
irt f lie iicritic w u t c w of the northern Gulf of Mexico is being modified
t o ac*hicw. litiid~tird tritnsport by means of tidal currents. The landwiircl t m n s p r t in achicved by the tendency of Lwifer t o swim up
iitt’o, or remain r i l ) in, the wcitm column during a footling tide and to
drop out of th(3 tvitttbt* cwliiinti (Iiiriiig t i t i chhitig ti& (M‘ootlmansw,
200
800
10
100
Night‘
(2100) \
I
0 10 20 30 40 50
1000 -I
L 1000
b’ic:. 7. Vcrt,ical tlist,rit)ut,ior) of pdayic Hhrimp t i f f Canary Tsltmtl. A, tht: variation of
Day and night totals in numbetw rmr haul (log scale).
Day and night totals in g per
C:. tho vuristion in the numbor of speaies per haul (after Foxton,
t,ot,ul catch with depth.
13, thtr variation of d~capod t)iom&Ys with depth.
two-hour tow,
I970b).
v(hllowtii1 roc.ltfinlr Sdmstos (as S~b(itstodvs) , j h k . l u s (Ayres) off IYad1ingt#oti (1’cbreyr:L ct ctl., I Wu). Nwvia Zuwns is ciaten by tlit: gurnnrtl
/,c~pidntri!~lrt nic*lnptorr~ (:iitit,hct* i t i SitrlrgiL 1Jt~y (Kosake at al.. 1969).
‘ I ’ l i w ~ tl:Lt,iL siiggwi that thry dcsc~~nd to t h c vicinity of t hcA sea-floor
I)y tliiy ill piLrticwliLr loculit ies w i t 1 s(wm~s. Pci*c~yra et at?. (1969) suggt‘stttd that tlw prtwditig wrrcwl t raiisport ctl i I i r vertical migrating
iitiiinnls cluihg the iiight to t h c t’tlgi’ of thr cwiyon where the depth
w i n sli~.llowc~r than their iisiitll chytinicb rcBxitlenc-c tlcpth and they thus
! ) t w i t n c l coticrmtretc~tl a t or near tht. bottoni \vhrre they might be more
avtdiibltl t o thc. predtitory spwirs. Omori ( 1 9fi9a) found that the
vtlrticul (listrihittioii of S ’ c y i ~ Zitcc>ns is nioct’ intirriutely associated with
t 1w bottoni i n withbr tnonths. ‘rhe diurnal migration of the species is
intitit- obliquely betwcw the offshore. deep layers and thc inshore,
slidlow Isycw (Fig. 8). As tlie speciel;; xcatters widely between 150 and
:350 ni by (lay rmrl is often abundant from 3 4 to 10 m above t h e bottom
t1t’ilt’ thct stcep cwtitinentiil slope, they can be eaten. even in the other
s(!iiHOIIs, by pelagic fish living close to the sea-floor.
rt8 is siiggcst,ctl that the diiirnal vertical migration of Lucijer fanmi
irt f lie iicritic w u t c w of the northern Gulf of Mexico is being modified
t o ac*hicw. litiid~tird tritnsport by means of tidal currents. The landwiircl t m n s p r t in achicved by the tendency of Lwifer t o swim up
iitt’o, or remain r i l ) in, the wcitm column during a footling tide and to
drop out of th(3 tvitttbt* cwliiinti (Iiiriiig t i t i chhitig ti& (M‘ootlmansw,