| Titles |
|
English :
|
Impact of low water temperature on natural immunity of Oreochromis niloticus with special reference to haematological and pathological responses
|
|
Arabic :
|
تأثير درجات الحرارة المنخفضة على المناعة الطبيعية فى اسماك البلطى مع المراجعة الخاصة لاستجابة الدم والانسجة.
|
|
| Abstract |
The impact of sharp water temperature drop from 25 ± 1C to 10 ± 1 C on natural O.niloticus serum killing activity as well as the consequent haematological , histological and experimental challenge responses were studied . The natural killing activity of O.niloticus fresh serum taken from temperature stressed fish was almost stopped in comparison to the optimum activity in non-stressed fish continuously kept at 25 ± 1C . Haematlogical responses were represented by significant decrease in total leukocytic and lymphocytes counts 70 h post temperature drop . Although non of the temperature stressed fish died , they displayed histological nephrotic changes in the form of cloudy swelling and hyaline droplet degeneration of the renal tubular epithelia 48 h post temperature drop . Challenging trials with Aeromonas hydrophila strains as an estimate of natural immune status and disease resistance of fish groups at 10 ± 1C and 25 ± 1C proved that temperature stressed fishes got infected after challenge . In comparison , fish groups kept at 25 ± 1C developed resistance to the acquisition of infection post challenge . The relative association of virulence profiles of A.hydrophila strains with the serum killing activity and the pathology of challenged fish is also discussed .
|
| Publication year |
2003
|
| Organization Name |
Animal Health Research Institute (AHRI)
|
| Country |
Egypt
|
| serial title |
مجلة الباثولوجيا المقارنة والباثولوجيا الاكلينيكية
|
| Department |
Fish Diseases
|
| Author(s) from ARC |
|
| Agris Categories |
Animal diseases
|
AGROVOC
TERMS |
Immunity.
Oreochromis niloticus.
|
| Proposed Agrovoc |
low water temperature ;
|
| Publication Type |
Journal
|