Common Fish Diseases
The various types of fish diseases are:

CONSTIPATION

Fish has difficulty in passing motion.
LOSS OF APPETITE
Fish does not respond quickly to feeding.
MOUTH FUNGUS (Chondrococcus Columnaris)
The fish develops white cotton-like tufts (fungus growth) and the region around its mouth may become swollen.
BODY FUNGUS (Saprolegnia and Achlya)
The growth of thin threads on the skin or the fin of the fish characterizes fungus. If fungus growth is severe, it may resemble tufts of cotton wool.
TAIL AND FIN ROT
The fins and tail of the fish will fray and degenerate. There is also discoloration.
RED SPOTS
There are red spots on body and tail of the fish without any physical wounds.
BLEEDING VEINS ON FINS
Red veins running on the fins.
SWIM BLADDER PROBLEMS
Fish affected floats upside down or sideways or finally rest at the bottom of the aquariums. This disease is common in goldfishes.
STRESS
Fish becomes jumpy and nervous, fins collapsed and tend to dart about in the tank.
COTTON LIKE GROWTH ON GILL FILAMENTS (Fungus)
There is growth of thin threads on the gill filaments of the fish.
EGG FUNGI
Eggs turn white and have thin white threads that resembles tufts of cotton wool (fungus growth).
 
FLUKES (Gyrodactylus and Dactylogyrus)
The colours of the fish fades and it grows pale. The fins are folded and gradually torn while the skin becomes more slimy than normal.
 
VELVET DISEASE (Oodinium Limneticum)
There is an appearance of yellowish spots on the skin that looks as though peppered with fine gold dust. It is easily visible from the front.
 
LISTLESS BEHAVIOUR
The fish hides in one corner with the fins closed and has no interest in food.
 
POP-EYE (Exophthalmus)
A disease that occurs in fish in which the eyes swells and becomes too large for the orbit and it protrudes out.
 
EXTERNAL INJURIES AND WOUNDS
Injuries and wounds sustained due to fighting among fishes or fish may have knocked against tank decorations, walls, rocks, etc.
 
WHITE SPOT (Ichthyophthirius Multifiliis)
The fish's skin and fins are covered with tiny White spots.  The fish may sway and twitch the fins and scratch against objects in the tank or pond.
SLIMINESS OF THE SKIN AND FIN (Chilodonella,Costia and Cyclochaeta)
The disease occurs as a formation of a slimy secretion on the skin of the fishes. The colours of the infected fishes are pale while the slime covers the whole skin surface like a thin grey fog.


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