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Abstract
A total of 120 random samples of Clarias lazera, Tilapia niloticus and Synodontius schall (40 of each) were collected from different fish markets in El- Gharbia governorate to be examined bacteriologically for isolation and identification of Aeromonas species particularly Aeromonas hydrophila.
The obtained resuls indicated that Aeromonas species were detected in 77.5%, 67.5%, and 47.5% of the examined samples Clarias lazera, Tilapia niloticus, and Synodontius schall, resprctively.
Furthermore, the total Aeromonas count ranged from 3 ×10 2 to 5.7 ×10 5 with an average 8.47 ×104 ± 2.15 × 104 / g for Clarias lazera, 1 ×102 to 2.3 ×105 with an average 1.98 × 104 ± .31 × 104 / g for Tialapia niloticus, and 1 × 102 to 9.6 × 10 3 with an average 3.79 × 103 ± .67 × 10 3 / g for Synodontius schall.
Also, non of the examined samples of Clarias lazera had Aeromonas count 10 -< 102, while, 32.5% of Clarias lazera had Aeromonas count ranged from 10 4 -< 105, and 25% of Tilapia niloticus had Aeromonas count 104- < 105, while, 27.5% of Synodontius schall had Aeromonas count ranged from 103 - < 104 .
The differences between the examined samples of different fresh water fish as a result of total Aeromonas count were significant (P< 0.01).
Psychrotrophic bacteria including Aeromonas species, Acinetrobacter species, Alcaligenes species, Chromobacterium species, Flavobacterium species, and Pseudomonas species were isolated in different percentages from all examined samples of fresh water fish.
Moreover, A. hydrophila showed the highest incidence in samples of Clarias lazera followed by Tilapia niloticus, while it failed to be detected in all the examined samples of Synodontius schall.