Role of mucus in protection of some bacterial fish disease

الملخص EN

A total number of 50 fish were represented as 25 wild African catfish (Clarias gariepinus) each about 300g and 25 of cultured Nile tilapia (Oreochromis niloticus) each about 250g, alive and apparently healthy were collected randomly.

The cutaneous mucus of these fishes were collected each in test tube with cover.

A buffer solvent was added to the mucus and then centrifuged in cooling centrifuge then take the supernatant to deter-mine the different protein concentrations and detect the antimicrobial ac-tivity.

The total protein, albumin and globulin of C.gariepinus were 1.25, 0.4 and 0.86 g / dl respectively, while in O.

niloticus were 2.3, 1.08 and 1.26 G / dl respectively and A / G ratio was 0.8 in C.

gariepinus while in tilapia was 0.75.

The antimicrobial activity was tested against (Aeromonas hydrophila, Pseudomonas fluorescence and Staphylococcus aureus).

The C.

gariepinus mucus was very effective at the first 6hrs and its action prolonged for 12hr and the activity was nearly equal against the three strains.

The O.

niloticus mucus was not effective in the first 6 hours.

After the first 6hrs its action become so potent in inhibition of bacterial growth for the all strains.