Walter, T.C. & Boxshall, G. (). World of Copepods database. Argulus japonicus Thiele, Accessed through: World Register of Marine. Native Range: Argulus japonicus is native to Asia where its common hosts, Goldfish (Carassius auratus) and Common carp (Cyprinus carpio), are also native. Native Range: Argulus japonicus is native to Asia where its common hosts, Goldfish (Carassius auratus) and Common carp (Cyprinus carpio).

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Abstract Fish lice Argulus spp; family Argulidae are branchiuran crustaceans that parasitize both marine and freshwater fishes.

Taylor and Francis Many fish host this louse, which is probably able to parasitize almost every species of freshwater fish. Branchiura infestation on lionhead goldfish Carassius auratus in Iran.

Argulus japonicus – Wikipedia

It attaches itself to the gills, fins or skin of the host using its suckers, and then feeds by injecting a toxin into the host which pre-digests the tissue. The most effective treatment against argulusosis is organophosphates, which usually are given as 2 or 3 doses at 1-wk intervals to kill emerging larvae and juveniles.

Changes of histopathology on host were congestion, baoning degeneration, epithelium erosion and inflammatory cell infiltration.

In addition, the lobes are more pointed argu,us A. Fish diseases and disorders2nd ed. As soon as any Argulus organisms are identified, management and treatment are recommended because infections can escalate rapidly.

Currently, there are no FDA-approved drugs for the control and treatment of this parasite, but several chemicals including organophosphates and diflubenzuron have been used with success.

Because our facility did not have a severe outbreak, and only a few fish were affected, we opted for the conservative approach of manual removal of lice without further medical intervention. Infectious and parasitic diseases of fish and shellfish. The image of infected leukocytes infested by Argulus japonicus were 8. Retrieved from ” https: Gross examination of the fish revealed that the shadow was a live organism resembling a fish louse.


The insecticide Dipterex is able to kill both adult and larval stages of Argulus japonicus ; however, eggs are unaffected by this treatment, meaning an initial application of the compound must be repeated after 2 weeks after which any eggs laid will have hatched in order to achieve an effective reduction of the parasite.

Argulus spp can be a major threat to fish health. Juvenile Argulus lice attach to the host by means of the claws, whereas adults attach by means of a pair of modified suckers commonly referred to as maxillules.

On the ventral surface of the louse head are short antennules and antennae, both of which have claws and function as organs of attachment to the host. The parasite becomes an adult and begins laying eggs in weeks at C.

Under low magnification, Argulus -associated lesions appear as craters, which form due to hyperplasia of the epidermis at the margins of the wound. In addition, this parasite can penetrate through to the stratum spongiosum of the dermis and even to the stratum compactum beneath; consequently the dermis becomes edematous. The screening and quarantine of incoming fish is the best way to avoid a facility-wide Argulus infestation.

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Fish Lice (Argulus japonicus) in Goldfish (Carassius auratus)

In addition, the parasite can be identified on wet mounts of affected tissue. This site uses cookies. Heavy infestations of this parasite can cause significant morbidity and mortality. In addition, fish lice are known to be the vehicle for other fish diseases.

Mucus and club cells are absent from any epidermis remaining in the crater but are abundant in the tissue at the margin of the crater. These parasites were removed and placed in the beaker with the first specimen.


Content from this work may be used under the terms of the Creative Commons Attribution 3. This study was aimed to determine the impact of ectoparasite Argulus japonicus infestation on host freshwater ornamental fish from Familia Cyprinidaein order to find a preventive solution jappnicus treatment on the host. These goldfish were asymptomatic, and no additional cases were noted after manual removal of the lice.

Structure of the adult ovary and oogenesis in Argulus japonicus Thiele Crustacea: Source water should be evaluated to ensure that it is not a route for the introduction of argulid eggs.

It has a stumpy tail, and is shaped somewhat like a round shield. We would also like to thank Dr.

Fish Lice (Argulus japonicus) in Goldfish (Carassius auratus).

The body length in female: One of the constraints of freshwater fish cultivation is ectoparasite infestation Argulus japonicus. Pathology The lesions become eroded and haemorrhagic since Argulus pierces the host ‘ s skin with a preoral sting and injects toxic substances followed by feeding the leaked blood with a proboscis-like mouth.

The most widely cultivated freshwater fish are from Familia Cyprinidae, among others goldfish Carassius auratuskoi Cyprinus carpio and comet goldfish Carassius auratus auratus.

After the lice had been removed, all goldfish in the affected system were monitored daily for evidence of adult Argulus ; 10 mo later, no more fish lice were noted.