Okanogan River on the way
to their spawning grounds. The migration con—
tinued when temperatures fell below 70° [21].
When given a choice, sh attempt to avoid lethal temperatures by moving
to water of a preferred temperature. For this reason, in winter when they
would ordinary seek warmer water by moving South, sh are often attracted
to the warm areas of efuents discharged from power plants. When the
power plants are shut down peodicay for cleaning purposes,
the warm ef—
uent is suddely cut off, there is a drastic drop in local water temperature,
and the sh may be killed. In january 1972, the Sports F ishery Institute Bulle—
tin reported the death of 200,000 baby menhadden after the operational shut—
down of a power plant in New jersey caused the water temperature to drop
ll°F ever a24—haur perind {22}. Fish do have varying abies to adapt to
.Œmgesr‘ntempeæüræsrææy must nermally CDp wir seasnnal temper—
aürre changes mææxær, 1ese changes are usually gradnal; very regaid
remnal
ÊSËŒEÈ nn ÎIS abnm to renrnthree în SŒBÏf
…
'ÆÎŒÊEÏ «arm Œntt‘æ t.;Æ“. '
«mm 53“.—
tira aaaaîæäaÈ drama anci‘ @ :…
Ëeæuse dftéætrpîtïgr, there have hear
t: Æ:«a% ?ΑŒ ear—
eîêä:l of pawer gïærŒ=—agææ—
…
aanta{ tr
5
the etîæt}; of direct heat en a
af argaäc angemma One tteh m&y was
made meyææ; &fÏ31‘æpœëæ' plant wæ Eat 15 ŒÎÏ‘.Œ Emm the
of
the Cannee‘œt Riva. A number of hieîtg_äcal aspects of the rive: were— &—
am‘inaä {war 3 ve—ae stratà &amüæm tram the plat Lcmhrnäogæî
that &iaätnta had bean repLaced br} bhre—geæz
Whftfæ ranætægäm @ Ï'fJÈÈÇK
àa—‘fa ez—Era în t‘tæ c‘Év—aaüw efgge—
wwnhæ
atthe
plant aaa. Dataaaaaataaage paint rar cam & aaΠa
cham
£?*säiït
«a the sh meäed Êe—z‘r nââ.er
tbe
hm ;;ùutt hf tht twa; @ht« thaat eætaaäat a» the appœäa bah: a
€ht fWé‘à‘ httt
gar—hat @ câh@tætgt jtnt@täk aaa mtag … tb
€ëh @@ ÿæéä€tÊ htttr €ht tttt@&î wata. 'Œe aveagam
that the
48
M Uñ€ôñô Fñtô—
to their spawning grounds. The migration con—
tinued when temperatures fell below 70° [21].
When given a choice, sh attempt to avoid lethal temperatures by moving
to water of a preferred temperature. For this reason, in winter when they
would ordinary seek warmer water by moving South, sh are often attracted
to the warm areas of efuents discharged from power plants. When the
power plants are shut down peodicay for cleaning purposes,
the warm ef—
uent is suddely cut off, there is a drastic drop in local water temperature,
and the sh may be killed. In january 1972, the Sports F ishery Institute Bulle—
tin reported the death of 200,000 baby menhadden after the operational shut—
down of a power plant in New jersey caused the water temperature to drop
ll°F ever a24—haur perind {22}. Fish do have varying abies to adapt to
.Œmgesr‘ntempeæüræsrææy must nermally CDp wir seasnnal temper—
aürre changes mææxær, 1ese changes are usually gradnal; very regaid
remnal
ÊSËŒEÈ nn ÎIS abnm to renrnthree în SŒBÏf
…
'ÆÎŒÊEÏ «arm Œntt‘æ t.;Æ“. '
«mm 53“.—
tira aaaaîæäaÈ drama anci‘ @ :…
Ëeæuse dftéætrpîtïgr, there have hear
t: Æ:«a% ?ΑŒ ear—
eîêä:l of pawer gïærŒ=—agææ—
…
aanta{ tr
5
the etîæt}; of direct heat en a
af argaäc angemma One tteh m&y was
made meyææ; &fÏ31‘æpœëæ' plant wæ Eat 15 ŒÎÏ‘.Œ Emm the
of
the Cannee‘œt Riva. A number of hieîtg_äcal aspects of the rive: were— &—
am‘inaä {war 3 ve—ae stratà &amüæm tram the plat Lcmhrnäogæî
that &iaätnta had bean repLaced br} bhre—geæz
Whftfæ ranætægäm @ Ï'fJÈÈÇK
àa—‘fa ez—Era în t‘tæ c‘Év—aaüw efgge—
wwnhæ
atthe
plant aaa. Dataaaaaataaage paint rar cam & aaΠa
cham
£?*säiït
«a the sh meäed Êe—z‘r nââ.er
tbe
hm ;;ùutt hf tht twa; @ht« thaat eætaaäat a» the appœäa bah: a
€ht fWé‘à‘ httt
gar—hat @ câh@tætgt jtnt@täk aaa mtag … tb
€ëh @@ ÿæéä€tÊ htttr €ht tttt@&î wata. 'Œe aveagam
that the
48
M Uñ€ôñô Fñtô—