1) Aeromonas hydrophila
Aeromonas hydrophila cause disease motile Aeromonas Septicemia (MAS). Another name for this disease is bacterial septicemia hemorrhagi or also known as hemorrhagic septicemia (McDaniel, 1979), infectious dropsy, red disease, pest red (Kabata, 1985) or red spot disease (Eidman et al., 1981). Signs of disease caused is
a) fish to be weak,
b) Decreased appetite,
c) The skin becomes rough,
d) The balance is disturbed,
e) fins broken,
f) bleeding in subcutaneous, gills, kumlah holes and internal organs,
g) Swelling in the abdomen filled with fluid,
h) abscess or ulcer
Motile Aeromonas Septicemia is attacking all types of freshwater fish, for example carp (Cyprinus carpio), carp (Osphronemus gouramy Lac), catfish (Clarias batrachus L), of all ages and sizes and there spread throughout the world. The mortality rate is high enough, it can even reach more than 90% (Eidman et al., 1981). There are four forms of the disease that is perakut, acute, subacute and chronic (McDaniel, 1979). Goldfish and fish attacked by Aeromonas hydrophila chef can be seen in Figure 8.
Figure 8. Goldfish and fish chef who attacked Aeromonas hydrophila
2) Aeromonas salmonicida
Aeromonas salmonicida is a short rod-shaped bacteria with a size of 1.3 to 2.0 x 0.8 to 1.3 μm, are gram-negative, do not move, do not form spores or capsules, are aerobic.
These bacteria can not live long without their host optimal temperature for growth is between 22-28 ° C, while at a temperature of 35 ° C are stunted. Can be found in freshwater environments and seawater and is known as a cause of disease “furunculosis”.
Aeromonas salmonicida than attacking the fish family Salmonilidae also attacks other fish such as eel (Anguilla spp.), Chubs (Coregonus zenithicus), dace, tenc, carp, catfish, pike, sculpins, perch, gold fish (Carassius auratus) and other fish species. There are indications that all freshwater fish species either sea or may be vulnerable to Aeromonas salmonicida. Clinical symptoms in the attack on the fish was swelling beneath the skin that usually become open sores filled with pus, blood and damaged tissue in the wound peak like a basin,
a) The fins breaking or broken,
b) Bleeding in the gills,
c) Petikiae in muscles,
d) intestine rear sticky and united, and
e) Swelling of the spleen and kidneys which develops into necrosis or tissue kernatian.
3) Renibacterium salmoninarum
Renibacterium salmoninarum known as the cause of kidney disease is a short rod-shaped bacteria with a size of 0,3-1,5 x 0, 1 to 1.0 μm, are gram-positive, not moving, without capsule, there are often paired and are aerobic. These bacteria can be found in freshwater environments and seawater with a temperature between 15-18oC optimal growth, while at a temperature of 25oC perturnbuhannya will be hampered. Renibacterium salmoninarum reported to affect fish family Salmonidae fish are attacked Renibacterium salmoninarum showing signs outside and inside like
a) The eyes stand out,
b) Abdominal bloating,
c) scales up,
e) Abscesses in some parts of the body and blackish color,
f) Kidney injury and colored gray, then utilized
g) Kidney swelling and necrosis.