Pharmacotherapy of Saprolegnia Infection of Fish
PST 06107
Basic Veterinary Pharmacology
Session 41: Pharmacotherapy of Saprolegnia Infection of Fishes
Learning Tasks
By
the end of this session students are expected to be able to:
Define Saprolegnia infection of fishes
List signs and symptoms of
saprolegnia
infection of fishes
Describe pharmacological treatment of
saprolegnia
infection of fishes
Describe control and prevention of
saprolegnia
infection of fishes
Activity: Buzzing
is Saprolegnia Infection of
Fishes
?
Definition of Saprolegnia Infection of Fishes
It is a
myocotic
disease known to potentially may affect all fish species in fresh water like Tilapia,
Clarias
,
Mugil
and rainbow trout
etc
It is also infective to eggs
The fungi of the genus saprolegnia are considered as secondary invaders of fish skin already damaged by abrasions and scale loss due to handling, netting, transfer and also skin lesions caused by
ectoparasites
notably by
argulids
Infections frequently occur on incubated eggs and newborn fry of rainbow trout in hatcheries
Signs and Symptoms of Saprolegnia Infection of Fishes
The
fungal mycelium will also penetrate into the muscle beneath the dermis resulting in;
Extensive necrosis of invaded tissues
Oedema
Extensive haemmorrhages
Activity:
Brainstorming
are the treatment and preventive measures for Saprolegnia Infection of Fishes?
Pharmacological Treatment and Prevention of Saprolegnia Infection of Fishes
Malachite
green oxalate (Zinc-free),
Dip, bath or flowing, applied to ponds at 0.15 ppm at holding tanks at a dose of 0.10 – 0.20 ppm for 1 h
Bath treatment, 0.1 ppm ‘Permanent’
Local (swab), 1%
Precautions: Highly toxic to juveniles of some fish species and some eggs very sensitive, especially at early stage
Pharmacological Treatment and Prevention of Saprolegnia Infection of Fishes
Cont.….
Prevention measures include;
Removing dead infected fish from the ponds
Proper sanitation of the ponds
Do not feed pets with raw fish
Key Points
The
Saprolegnia fungus infects fish (or its eggs), affecting its internal organs and deeper tissues
Symptoms include light
gray
, cottony growths on the skin, fins, gills, and eyes
The Saprolegnia fungal infection is caused by having an unclean environment containing dead and decaying organic matter
Treatment of the Saprolegnia infection is accomplished by medicating the water with potassium permanganate, after removing skin pathogens
Evaluation
What
is Saprolegnia Infection of Fishes?
What are the common signs and symptoms of Saprolegnia Infection of Fishes?
What is the pharmacological treatment of Saprolegnia Infection of Fishes?
What are the control measures against Saprolegnia Infection of Fishes
?
References
Riviere
J. E.,
Papich
M. G. (2009).
Veterinary Pharmacology and Therapeutics
(9
th
Ed) Iowa, Wiley-
Blackwel
Publishers
Hsu
W. H. (2008).
Handbook of Veterinary Pharmacology
(1
st
Ed) Iowa, Wiley-
Blackwel
Publishers
Kuafmann
J, (1996).
Parasitic infections of domestic animals
, (2
nd
ed
).Berlin,
Birkhäuser
Verlag
Press
Hoare
E. W. (2013).
A manual veterinary therapeutics & pharmacology
(2
nd
ed
),New
York, Forgotten Books
Press
Maddison
. J. (
ed
) (2008).
Small Animal Clinical Pharmacology
, (2nd
ed
). Philadelphia, Saunders Elsevier Limited
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