Effect of dietary astaxanthin against Aeromonas hydrophila infection in common carp, Cyprinus carpio.

The effect of astaxanthin at 0, 25, 50, and 100 mg kg(-1) incorporated in basal feed on immune response and disease resistance in Cyprinus carpio against Aeromonas hydrophila was investigated. When fed with 25 mg kg(-1) diet, the cumulative mortality was 35% whereas it was 10% and 20% with 50 and 100 mg kg(-1) diets. With all enriched diets the growth rate increased significantly from week 1 to 4 when compared with control.

Immune response and disease resistance of carotenoids supplementation diet in Cyprinus carpio against Aeromonas hydrophila.

The effect of carotenoid-supplementation diet on immune response and disease resistance in common carp, Cyprinus carpio against Aeromonas hydrophila at weeks 1, 2, and 4 is reported. The cumulative mortality was 10% when fish were fed with 50 or 100 mg kg(-1) supplementation diets while the un-supplementation diet treated group suffered 90% mortality against the pathogen. The phagocytic activity and complement activity significantly increased with 50 and 100 mg kg(-1) diet groups from weeks 2 and 4 but not in other groups.

Protective effect of chitin and chitosan enriched diets on immunity and disease resistance in Cirrhina mrigala against Aphanomyces invadans.

The effect of diet enriched with 1% chitin or chitosan on innate immune response and disease resistance in Cirrhina mrigala against Aphanomyces invadans was investigated at weeks 1, 2, and 4. In the un-infected and infected groups the white blood cells (WBC), red blood cells (RBC), haematocrit (Ht), lympocytes, monocytes, and neutrophils significantly increased when fed with 1% chitin (CH) or chitosan (CT) enriched diet from weeks 1 to 4 when compared to control; however, the haemoglobin (Hb) and thrombocytes significantly increased only on weeks 2 and 4. The total protein and albumin levels also significantly increased with any enriched diet on weeks 2 and 4; but the globulin and albumin:globulin ratio increased on week 4 as compared to control; similarly the phagocytic activity significantly increased on weeks 2 and 4 while the lysozyme activity increased from weeks 1 to 4.