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Disease Due to Bacteria On Fish

A. Mycobacterium sp
Mycobacterium sp. which is known as a cause of disease “fish tuberculosis” (Fish TB), is a rod-shaped bacterium, with a size of 0.2-0.6 x 1.0 to 10 μm, are gram positive weak, do not move, do not form spores or capsules and aerobic. These bacteria are often found in fresh and marine waters or soil with an optimum growth temperature 25-30oc. can not grow at 37 ° C unless m. Marinum, m. Fortuitum and m. Chelonei.

Mycobacterium sp. mode of transmission is not known with certainty suspected some of the possible is through contaminated food and water. In addition to attacking various freshwater fish or sea water, Mycobacterium sp. reportedly also attacked the frog, the types of lizards, snakes, crocodiles and turtles and turtle. In fish show signs such
a) swelling veins,
b) Eyes bulging,
c) The existence of wounds on the body,
d) pale eyes, lordosis,
e) Skeliosis,
f) ulcers or sores and fin damage (broken).
g) The presence of nodules colored grayish-white in the liver, kidneys and bladder.
h) Lumps found in various organs such as gills, pericardium, eye, bladder, kidney and liver.

Carp infected by Mycobacterium sp can be seen in Figure 10.
Figure 10. Carp infected with Mycobacterium sp showed ulcerative lesions on the body surface (left), organ bleeding (right).

B. Nocardia sp
Nocardia sp. is a bacterium that varies the shape is round, oval and filamentous rod, with a diameter of 0.5 to 1.2 μm, are gram positive, move, do not form a capsule and are aerobic. These bacteria are widespread in nature, including water and soil. The optimal temperature for growth between 28-35oC Nocardia asteroides, Nocardia kampachi While not grow at a temperature of 10 ° C or 37 ° C. Nocardia sp. in fish mode of transmission is not known with certainty Nocardia sp. reportedly attacked various freshwater fish and sea water, among others
a) Rainbaow trout (Oncorhynchus mykiss),
b) Brook trout (Salvelinus fontinalis),
c) Neon tetra,
d) Snakeskin (Trichogaster trichopterus),
e) Paradise fish,
f) Gurami
g) Yellow tail (Seriolla quinquiradiata).

Clinical symptoms in the affected fish is
a) Swelling in the affected organ (such as tumor),
b) ulcers or sores on the body surface,
c) Weak, decreased appetite and thin.
6) Edwardsiella tarda and E. ictaluri

Edwardsiella tarda and E. ictaluri is bent rod-shaped bacteria with a size of 1 x 2-3 μm, are gram-negative moves with the help of flagella does not form spores or capsules and are facultative anaerobes. These bacteria can be found in freshwater environments and sea water, with the optimum temperature for growth of about 35 ° C, whereas at temperatures below 10 ° C or above 45 ° C can not grow.
Edwardseilla tarda reported to affect fish freshwater and marine, among others:
a) Channel catfish (Ictalurus punctatus),
b) Chinook salmon (Onchorhynchus tshawyscha).
c) Common carp (Cyprinus carpio),
d) Crimson seabream (Evynnis japonicus),
e) Japanese flounder (Paralichthys olivaceus),
f) Japanese eel (Anguilla japonica),
g) Largemouth bass (Mycropterus salmoides),
h) Mullet (Mugil cephalus),
i) Red sea bream (Chrysophrys major),
j) Striped bass (Morone saxatilis),
k) Tilapia (Tilapia nilotica),
l) Yellow tail (Seriolla quinquiradiata),

While Edwardseilla ictaluri reportedly attacked
a) Channel catfish (Ictalurus furcatus),
b) Brown bullhead (Ictalurus nebulosus),
c) Blouses catfish (Ictalurus furcatus),
d) Danio (Danio devario),
e) Green knifefish (Eigemannia virens),
f) Walking catfish (darias batrachus),
g) White catfish (Ictalurus catus).

This peyakit attack symptoms in fish is
a) At the stage of mild infection appeared only minor injuries,
b) The development of more advanced disease, ulcers develop in the ribs and stomach muscles.
c) In the case of acute, rapidly growing festering wounds of various sizes,
d) Then the wounds filled with gas and looks a convex shape to spread throughout the body.
e) The body color is lost, and
f) injuries evenly throughout the body, if the wound is scratched, will smell the stench (H2S).