The fish is said to be ill when an abnormality both anatomically and physiologically. Anatomically occur deformity of body parts of fish as part of the body, head, tail, fins and belly. In physiological abnormalities in organ function of vision, breathing, digestion, blood circulation and others. Disease by spreading classified as follows;
1) Endemic disease outbreaks ie fish / shrimp on a certain area does not spread to other areas.
2) Epidemics spread of fish / shrimp that extends to other areas.
3) Pendemi spread of fish / shrimp covers the whole world
A. Causes of Fish Diseases
A disease that attacks the fish are caused by:
1) Microbes such as bacteria and viruses.
2) Parasites such as from the class of protozoa, crustaceans, fungi and others.
3) Environment-containing toxins (poisons).
4) Fluctuations high water quality parameters.
5) The food was not suitable.
6) Power Factor immune system of the fish itself.
B. Symptoms and Behavior fish due to attacks by pests and diseases
Diseased fish will show the instability of both physical and behavioral. Instability shown the fish can be characterized from several factors, namely:
1) Behaviour (behavior of the fish)
Diseased fish will exhibit behavior that is not usually done, because they feel uncomfortable with anything that sticks or intrusive body. Unusual behavior shown is:
a) The fish often swim in the water and look gasping (gasping).
b) The fish often rub-rub tubuhmya on a surface of the object.
c) The fish do not want to eat (appetite).
d) For the types of fish that most groups, the sick fish will secede and swim passively
2) Equibrium
Equibrium means balance, the fish are diseased balance will be disrupted and can not control his movements, so the fish swim unstable (wobbling), or jumping erratically, even hit the wall tubs.
3) External lesions
Diseased fish will show abnormalities in organs of her body, known as the abnormality. Abnormalities organ / External lesions in fish, among others:
a) discoloration, the fish are healthy have a normal body color according to its pigment. Abnormalities in colors that do not correspond to the pigment is a discoloration. Like dark colors become pale and others
b) The production of mucus, the sick fish mucus production will be redundant even to wrap the fish’s body depending on the severity of the infection rate.
c) organ deformities, caused by certain parasites that cause damage to organs such as the skin, fins, gills and others. Damage can cause their gills look pale or red spots, the fins and scales fall off and the skin is blistered
4) The condition factor
In healthy fish have a correlation between weight (M) and length (L) of fish a balanced, namely with the following formula:
The fish has a K value which varies depending on the type when the value K changes from normal then the fish is said to be ill. In healthy goldfish while K = 1.9 K = 1.6 while the sick fish that have K <1.4 then the fish can not live anymore.