Life cycle of protozoan parasites

1. LIFE CYCLE OF PROTOZOAN
FISH PARASITES
Shoriful Islam(ASH1602006M)
Bipul Chandra Das (ASH1602034M)
Md. Rony Kazi (ASH1602047M)
Humayra Amin (BKH1602052F)
Shanto Datta (ASH1602059M)

2. Parasite: Are those organisms which cling to relatively large animals externally or
internally for food & completion of their life cycle.
 Protozoan parasites of fish: Those microscopic,unicellular,free living parasites that
undergo protozoa phylum & attack on or in fish body.
 General Characteristics:
 Locomotory organs: Pseudopodia or flagella
or cilia.
 Nutrition: Holozoic, Holophytic ,Saprozoic or
parasitic
 Reproduction: Sexual or asexual.
 May be ectoparasitic or endoparasitic.

3. Protozoan parasites types according to
attacking sites of fish body
 Ectoparasites
 Lives on external surface of fish body
 Found on skin,gills & fins.
Commonly found ectoparasites are:
a. Ichthyophthirius multifiliis
b. Cryptocaryon irritans
c. Chilodonella uncinate
d. Ichthyobodo salmonis etc.
 Endoparasites
 Lives on internal surface of fish body
 Found on intestine , visceral cavity of fish
Commonly found endoparasires are:
a. Spironucleus salmonicida
b. Hexamita muris
c. Eimeria falciformis
d. Goussia carpelli etc.

4. Life cycle of protozoan parasites

5. Life cycle of Ichthyophthirius multifiliis

6. Effects & Prevention control
 Effects:
 Affected on skin,gills & fins [Freshwater species]
 Epidermal tissue changes & formation of epithelial ulcers.
 Causes minutes white spots & form nodule.
 Fish show irritation & restless.
 Prevention & control:
 Prevention of exposure of fish to the parasites
 Applying quarantine method.
 Formalin 160-250 ppm for 1 hour daily(dip bath)
 KMnO4 01% for 30-45 seconds
 NaCl 7000-20000 ppm

7. Life cycle of Cryptocaryon irritans

8. Effects & Prevention control
 Effects:
 Affected on skin,gills & fins [Marine water species]
 Ragged fins,cloudy eyes,pale gills.
 Increase mucus production.
 Irregular in skin colour
 Breath more rapidly
 Prevention & control:
 fish should be placed in a quarantine tank for at least 2-3 weeks to make sure
they are eating.
 maintaining water quality, correct nutrition, stable temparature, and meeting
habitat requirement.
 Copper solution medication are effective.

9. Life Cycle of Spironucleus salmonicida

10. Effects & Prevention control
 Effects:
 Especially invade on salmonid fish.
 Create fowl smelling.
 Pus-filled absesses in muscles & internal organ.
 Prevention & control:
 Elimination of stress and improvement of husbandry will help correct an
outbreak of spironucleosis.
 Apply quarantine method for prevention.
 Metronidazole can be administered in feed at a dosage of 50 mg/kg body weight
(or 10 mg/g feed) for 5 consecutive days.
 Make water changes (70–100%) each day before re-dosing.

11. Life Cycle of Eimeria falciformis

12. Effects & Prevention control
 Effects:
 Invade the intestine of fish
 Resulrs diarrhea,weight loss & dehydration.
 Significant damage to the intestine epithelial layer.
 Release of blood fluid & electrolytes into the intestine.
 Prevention & control:
 Water parameter should be maintained accurately.
 Apply quarantine method.
 The antidiarrhoeic drug may be used.

13. THANK YOU 