Parasites Study22

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Destroying tissue

Diverting part of its nutrient supply

Removing blood and cellular fluids

Allowing secondary infections to develop

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Acanthocep halans

Leeches

 
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Isopods

Molluscs

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   head  pereon    . somites      pleon     /   scavengers feeding   parasitic    Ý        

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Ýross sign •Sluggish •Stop feeding Effect on Host •Results in hemorrhagic enteritis •Reduce food intake (interferes with the absorptive processes ) Diagnosis •Dissection method „

 
       
           

Preventation •Eliminate intermediate hosts •Quicklime to destroy cestode eggs.

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Ýross sign •Emaciated •Darkened bodies Effect on Host •Necrotic hemorrhagic ulcers in the intestine •Ýrowth retardation and mortality Diagnosis •Ýross examination to reveal elongated and sac-like worms with retractile proboscis armed with spines

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Preventation •Quicklime •the water supply treated intermedi •suspected stocks should be quarantined.

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Diagnosis •Ýross examination •microscopic examinations Preventation •Removed mechanically 1. Bath in 200 ppm formalin until the parasite detach from the host. 2. Dry the pond bottom for several weeks, followed by liming to controle the adults. 3. Kill the detached parasites by crushing or other physical means.

Ýross sign •skin, •fins • eyes operculum •mouth linings

Effect on Host •Anemia & may show secondary bacterial infections •act as vectors of viruses, bacteria, and protozoan blood parasites

Diagnosis •Ýross examination •microscopic examination Preventation 1. Leeches may be removed from the culture water by filtration. 2. the manual removal of marine leech using a wet cloth. 3. A bath of 100 ppm formalin for 1 hr is effective. 4. Treated fish must be transferred to a clean, parasite-free tank. 5. Culture facilities must be cleaned properly and exposed to intense sunlight for several weeks prior to use.

Ýross sign •Attached to gills •& Outer surfaces of fish. Effect on Host •Ýill tissue is destroyed •Lead to secondary bacterial and fungal infections •Disruption of respiratory function Diagnosis •Ýross examination •microscopic examination

Preventation •Filter the culture water

  
        
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