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Antagonistic Probioticity of Novel Bacterial Isolates from Pakistan against Fish Pathogen Pseudomonas fluorescens in Labeo rohita Fingerlings

Antagonistic Probioticity of Novel Bacterial Isolates from Pakistan against Fish Pathogen Pseudomonas fluorescens in Labeo rohita Fingerlings

Asma Chaudhary1, Qurat-ul-Ain Ahmad1, Afia Muhammad Akram1, Sadia Roshan2 and Javed Iqbal Qazi3*

1Department of Zoology, Division of Science and Technology, University of Education, Lahore, 54770, Pakistan
2Department of Zoology, University of Gujrat, Gujrat, Pakistan
3Department of Zoology, University of the Punjab, Lahore, 54590, Pakistan

*      Corresponding author: qazi.zool@pu.edu.pk

Fig. 1.

Effect of inocula sizes on growth of the probiotic isolates Sphingomonas sp. AsCh-P3 (a) and Bacillus aerius AsCh-A7 (b) in fish feed extract (20% w/v) at room temperature for different incubation days.

Fig. 2.

Symptoms of Pseudomonas infection i-e swelling of belly (a), swelling of anus (b), reddening of belly (c) and damage of scales (d) following i-p administration of P. fluorescens (268×103 C.F.U.ml-1).

Fig. 3.

Appearance of surviving fishes (asymptomatic) of negative control (a), positive control challenged with P. fluorescens (b), treated by Sphingomonas sp. AsCh-P3 (c-e) and Bacillus aerius AsCh-A7 (f-h) representing for different experimental groups G1a, G1b, G1c, G2a, G2b, G2c, respectively.

Fig. 4.

Surviving fishes with varying degrees of caudal fin deformation by P. fluorescens in G2 group (a, b) treated with B. aerius AsCh-A7 and muscle degeneration by P. fluorescens in positive control C3 (c) and experimental groups G2b, G3b (d, e) treated with Sphingomonas sp. AsCh-P3 and B. aerius AsCh-A7, respectively.

Pakistan Journal of Zoology

June

Vol. 53, Iss. 3, Pages 801-1200

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