parasitic diseases in cultured fishes
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Parasitic Diseases in cultured fishes. By. Dr. Mohamed S. Mohamed Marzouk Professor of Fish Diseases and Management , Faculty of Veterinary Medicine, Cairo University. Parasitic Diseases of cultured fishes. Common Parasites in cultured fishes:. Fish Protozoa (unicellular). - PowerPoint PPT PresentationTRANSCRIPT
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Parasitic Diseases in cultured fishes
Dr. Mohamed S. Mohamed MarzoukProfessor of Fish Diseases and Management , Faculty of
Veterinary Medicine, Cairo University
By
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Parasitic Diseases of cultured fishes
Common Parasites in cultured fishes:
Fish Protozoa (unicellular).
Fish Helminthes (multi-cellular).
Fish Parasitic Crustaceans.
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Commom protozoa in cultured Fishes:
1. Exteranl cilliated protozoa:
Ichthyophthirius multifillis
Chilodonella spp.
Trichodina spp.
2 .Internal fish protozoa:
Flagellated Hexamita spp.
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Ichthyophthirium multifilis trophozoit (Stained )
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Ichthyophonus multifillis (unstained)
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Stained Trichodina from skin mucus scraping
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Pathogenesis of external protozoa
Protozoal invasion
Skin cellular irritation 1. Abnormal swimming
2 .Excessive mucus
Skin cellular destruction
1. Haemorrhages
2. Erosions and ulcers
3. C.T capsules (White spots).
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Life cycle of Ichthyophthiriosis
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Clinical signs
Abnormal swimming ( Flashing, circling, sluggish and itching ).
Surfacing and gasping ( Asphyxia ).
Excessive skin mucus ( patchy then generalized ).
Pathognomonic white spots (Ichthyophthiriosis).
Emaciation and death.
Skin haemorrhages, erosions and ulcerations.
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White spot disease
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Cryptocarion irritans infection in marine fish
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Diagnosis of External parasitic Diseases
1. History ( new introduced fish, water parameters,………
2. Clinical signs and lesions.
3. Demonstration and identification of the causative parasites
Skin and gill mucus scraping (wet mount). Stained skin and gill mucus smears.
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Treatment of External parasitic Fish Diseases
External chemical treatment
Dip treatment Bath treatment Flush treatment Indefinite bath treatment
Non-chemical treatment
Increase water temperature in White Spot disease Use of ultraviolet radiation in re-circulating system
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Types of Chemical treatments
1 .Disinfectants:
Pot. Permenganate. Malachite green. Formaline. Na Cl. Acriflavin. Methylene blue.
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2. Pesticides:
Chlorinated Hydrocarbones.Organophosphates.
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Control of Fish diseases in infected fish farms
In infected earthen ponds:
o Drainageo Drynesso Disinfection using quick lime
In infected concrete or fiberglass fish tanks:o Drainageo Disinfection with strong antiseptics
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Hexamitiosis Systemic infection caused by an internal flagellated
protozoa
Causative protozoa:
Hexamita intestinalis
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Mode of infection and transmission:
1. Infection through ingestion.2. Transmission is from dead fish and contaminated water body.
Pathogenesis
Hexamita is normal inhabitant of intestine
Small numbers Large numbers
Intestinal irritation
Intestinal destructionNo signs
Excess mucus
Systemic form
Off food & emaciation
Hole in head
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Clinical signs:
1. Off food.
2. Emaciation and tucked up abdomen.
3. Mucus shreds from the vent.4. High mortality in severe cases.5. Hole in the head in systemic form (Fistula behind the head exuding white material).
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Diagnosis
Clinical signs and lesions (Non-confirmative)
Laboratory ( Confirmative)
Sampling ( Intestinal mucus )
QualitativeQuantitative (Count/ MF)
0 - 5 = Negative5 – 15 = Mild15 -30 = Moderate30 – 100 = SevereMore than 100 = Marked
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Treatment and control
1. Expulsion
2. Hexamiticides
Saline purgative (MgSO4)
1. Aresenical (Carbersone).
2. Murcurial (Calomel).
Not to be used in food fishes
Sulfonamides
Can be used in food fishes
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Fish Helminthosis
Helminthes of fishes
Platy helminthes
Round worms
Trematodes
Cestodes Larvae A dults
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Fish Trematodes
1. Monogenea 2. Digeanea
Gill flukes Skin flukesAdults
Encysted metacercaria
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Gill
flukes
1. Dactylogyridae
2. Cichlidogyridae
Dactylogyrus vastator (D. vastator)
Cichilidogyrus tilapiae (C. tilapiae)
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D. vastator
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C. tilapiae
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Gill fluke attached to fish gill filaments
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G. elegans
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Skin fluke attached to fish skin
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Haemorrhagic granuloma of Lernea copepode
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Lernea cyprinicae
Anchor2 egg sacs
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Fish lice ( Argulus sp.) attached to fish skin
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Ventral view of Fish Lice
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