Presentation on theme: "Parasitic Diseases in fishes"— Presentation transcript:
1 Parasitic Diseases in fishes ByDr. Mohamed Sayed Mohamed MarzoukProfessor of Fish Diseases and Management , Faculty of Veterinary Medicine,Cairo University
2 Parasitic Diseases of cultured fishes What is meant by Parasite ?ًClassification of different parasitesProtozoa (unicellular).Helminthes (multi-cellular)Crustaceans
3 Protozoa According to habitate: According to shape: External. Internal (Blood and Tissue).According to shape:Cilliates (Icthyophthirius, Chilodonella, Trichodina).Flagellates (Ichthyopoda, Trypanosoma, Cryptobia, Hexamita).Sporozoa (Myxosoma).
16 Diagnosis of External parasitic Diseases 1. History ( new introduced fish, water parameters,………2. Clinical signs and lesions.3. Demonstration and identification of the causative parasitesSkin and gill mucus scraping (wet mount).Stained skin and gill mucus smears.
17 Treatment of External parasitic Fish Diseases External chemical treatmentDip treatmentBath treatmentFlush treatmentIndefinite bath treatmentNon-chemical treatmentIncrease water temperature in White Spot diseaseChange water facilityUse of ultraviolet radiation in re-circulating system
18 Types of Chemical treatments 1. Disinfectants:Pot. Permenganate.Malachite green.Formaline.Na Cl.Acriflavin.Methylene blue.
20 Control of Fish diseases in infected fish farms In infected earthen ponds:DrainageDrynessDisinfection using quick limeIn infected concrete or fiberglass fish tanks:Disinfection with strong antiseptics
21 Hexamita intestinalis HexamitiosisSystemic infection caused by an internal flagellated protozoaCausative protozoaHexamita truttaeHexamita salmonisHexamita intestinalis
22 Hexamita is normal inhabitant of intestine Mode of infection and transmission:1. Infection through ingestion.2. Transmission is from dead fish and contaminated water body.PathogenesisHexamita is normal inhabitant of intestineLarge numbersSmall numbersSystemic formIntestinal destructionNo signsIntestinal irritationHole in headExcess mucusOff food & emaciation
23 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 headexuding white material).
25 Can be used in food fishes Not to be used in food fishes Treatment and control2. Hexamiticides1. ExpulsionSulfonamidesSaline purgative(MgSO4)Aresenical (Carbersone).Murcurial (Calomel).Can be used in food fishesNot to be used in food fishes
26 Fish Helminthosis Helminthes of fishes Helminthes infection or infestation ?Helminthes of fishesPlaty helminthesRound wormsTrematodesCestodesLarvaeA dults
27 Encysted metacercaria Fish Trematodes1. Monogenea2. DigeaneaAdultsGill flukesSkin flukesEncysted metacercaria
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