1) Class monogenea
Monogenea is a kind of worm that attacks the outer body of the fish, in terms of where the attack is divided into two types:
a) The worm attacks the gills Dactylogyrus
b) Gyrodactylus worm attacks the skin.
While symptoms or signs of parasites in fish are:
a) The gills of fish broken, wounded and bleeding arise.
b) tapered fins, sometimes even hair loss occurs on the tail fin.
c) The fish rubbing his body to the bottom of the pond or other hard objects.
d) The skin becomes slimy and pale.
Capillaria is the name of a genus of worm nematodes that attack the body parts in fish. This worm is a parasite on the digestive system and also in fish liver. Capillaria known to frequently attack fish Discus (Symphysodon spp) and Angelfish (Pterophyllum spp). In light infestation Capillaria often does not cause symptoms mean. While in heavy infestations are usually characterized by symptoms of “emaciation” or a thin body, loss of appetite, issued a white and thin dirt, or debris with colors alternating between dark (black) and bright (white).
In the dead fish, the presence of this worm can be found by doing surgery and observation of the fish entrails. Capillaria generally have the length of between 0.5 to 2 cm in diameter approximately the size of a hair. In fish live observations can be carried out on fish feces under a microscope, observing Capillaria eggs that would normally participate in the feces of fish concerned.
Capillaria presence is usually caused by infection of other fish which have been infected before. Capillaria not require a specific host, so that the infection can only be done by another infected fish. Capillaria worms can be seen in Figure 21.
Figure 21. Worms Capillaria