الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Annout catfish were maintained at optimal environmental conditions where ~the water temperature adjusted at 22°C, the fish diet was offered daily at the rate of 1% of the total biomass and the stocking density was 15,0 g /Ld had a vagorous antibody response to Aeromonas~strain These antibodies were detected in the serum of infected fish from the first week with good amount and reached to
its maximum concentration at the end of the taurth week, The low water temperature that was adjusted at (13 پ} 1°C) possessed a direct imunosuppression effect on the fish maintained at this temperature, As they had a poor antibody response incomparison with, the vigorous antibody response of the control group and the maximum titer
reached at the end of the third week post~inoculatioh,
In contrast , the fish maintained at high water temperature
(28°C) had a vigorous antibody response to great extent
similar to the control Fish fasted for 2 weeks proir to injection of Aeromonas ~2≥ila strain and for the duration of the study and ma~~
ntaiiaed under environmental condition virtually identical
to the controls had antibody response not significantly
different from those of the controls Fish also maintained under crowded conditions (75o0 g of body mass/b) had antibody response not significantly different from those of the controls Fish exposed to combined environmental conditions had immune responses to some or great extent different from
those of the controls This defferences depend upon the
presence or obsence of low water temperature which is the
only factor enable to induce Immune suppression in Anout
catfish exprimentally injected with Aeromonas~
antigen0 3.— Fish exposed to fasting with low water temperature
(13 پ} 1°C) had a poor antibody response inoomparison
with the vigorous antibody response of the control group and the maximum titer reaohed at the end of the thi~ rd week, In contrast ~ the fish exposed to fasting and high water temperature (28°C) had immune response to some extent different from those of the controls •
2~ Fish exposed to overcrowding (75~O g of body rnass/L )
with temperature (13 پ} 1°C) had immune responses to
great extent differed from those of the control group
and the maximum titer reached at the end of the third
week In contrast9 the fish exposed to overcrowding
with high water temperature (28°C) had antibody
response to some extent different from those of the
controls 3~ :?i2h exposed to fasting and overarowaing bad antibody
response to some extent different from those of the
controls 4~ Fish exposed to fasting9 overorowdixig and low water
temperature (13 پ} 100) had antibody response to great
extent different from those of the control group
and the maximum titer reached at the end of the third
week0 In contrast9 the fish exposed to fasting ~ ove
overcrowding and high water temperature (28°C) had
antibody response to some extent diffe~ent from those
of the controls The antibody response was evaluated by microagglutjn
ation test and passive heamagglutinatjon test0 The compar.~
ison between the antibody titer evaluated by each test
indicates that~ the passive hea~agg]attmnatj~~ is more
sensitive than micro~glutinatjon for the detection of
antibody in the serum.