It is a Nematode parasite, generally found in the intestine. Body cylindrical, filiforms and covered with a strong protecting cuticle which is flexible. Mouth is dorsoventrally slight bounded by six papillae. Male comparatively smaller than female. Male, body length 5.97-6 83 mm and width 0.91-1.12 mm. Female body length 8.78-8.96 mm and width 0.97-1.89mm. The disease caused by Procamallanus sp. called Procamallanosis
Lytocestus sp. is a parasite. It is known as “Entire worm”. Body elongated, dorsoventrally flattened, unsegmented leaf like. Tapering anteriorly into scolex, head consists of scolex and neck, scolex variable in shape, undifferentiated. Neck not markedly distinguished from scolex or trunk. Body length 15.23 – 18.11 mm and width 2.00 -3.54 mm. They are mainly found in shing, taki, magur etc. The disease caused by Lytocestus sp. called Lytocestosis
It is another Monogenean parasite, well known as skin fluke. Body length 0.400-0.413 mm and width 0.124-0.133 mm. Body ventrally flattened. Anterior end of body has two points and has no eyes. At hind end a disc-shaped attachment organ present bearing two central books surrounded by 16 smaller hooks. Various species of fish are affected by this parasite, mainly shing. Carp fish etc. The disease caused by Gyrodactylus sp. called Gyrodactylosis
Dactylogyrus sp. is one of the biggest genera of Monogenean parasite. It is well known as gill fluke. Body elongated, length 0.287-0.395 mm and width 0.69 – 0.91 mm. They have four lobed head and four black eyes. The intestinal limbs are confluent posterior. The ovary lies in front of the testis. Dactylogyrids lay eggs and live as parasites, particularly on the gill. The diseases caused by Dactylogyrus sp. called Dactylogyrosis. Carp fish commonly silver carp, beside that shing, magur also affected by this parasite.
Trichodina sp. is a Protozoan parasite. Body cup shaped, diameter 17.0— 61.8 µm. Adhesive disc concave diameter 13.7—48.5 µm.. Adoral ciliary spiral 395—400. Free swimming with numerous long cilia surrounding the body. They are looks like a watch glass, bell-jar or a hat. The central part is delicate and sloped posterior. The disease produce by Trichodina sp. called Trichodiniasis (Fig. 4.2).