Early infection of discus <i>Symphysodon aequifasciatus</i> altricial larvae by <i>Sciadicleithrum variabilum</i> (Monogenea)

Önal, Umur; Çelik, İhsan; Tokşen, Erol; Sepil, Ahmet; ÇAydan, E.

doi:10.1111/j.1095-8649.2010.02841.x

Cited by 5 publications

(4 citation statements)

References 12 publications

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Section: Discussionmentioning

confidence: 99%

“…In the case of S. aequifasciatus, larvae infested with S. variabilum showed gill damage at the sites of parasite attachment, but there was no proliferative cell response in the gill (Onal et al 2011). In Onal et al (2011), they found the first occurrence of S. variabilum in the discus was observed when gill differentiation was completed and before complete resorption of the yolk sac. Different re sponses of the gill apparatus to parasite infestation occurring both in the larval stages during parental care (Onal et al 2011) and in discus aged 3 to 6 mo (present study) need further investigation, especially regarding the physiological changes in the gill apparatus during development.…”

Section: Discussionmentioning

confidence: 99%

“…The discus fish genus Symphysodon, has a natural distribution in the Amazon basin. Discus fish of any species have always been highly rated by aquarists (Onal et al 2011, Aquaro et al 2012.…”

Section: Introductionmentioning

confidence: 99%

“…Their propagation is an important source of income for some Asian countries (Aquaro et al 2012, Wen et al 2017. High mortality of discus in fish facilities can cause large economic losses for fish breeders, and such situations have been reported in many countries, including Poland (Onal et al 2011, Aquaro et al 2012, Sobecka et al 2012. Discus breeders in Poland suspect that the high mortality observed in their cultures can be caused by gill parasites (communications from the breeders).…”

Section: Introductionmentioning

confidence: 99%

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The gill monogenean Sciadicleithrum variabilum induces histomorphological alterations in the gill tissues of the discus Symphysodon aequifasciatus

et al. 2022

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High mortality is among the most serious problems and challenges in the ornamental fish trade. Examination of the discus Symphysodon aequifasciatus from ornamental fish hatchery revealed infestation with the monogenean Sciadicleithrum variabilum. Gill infestation with this monogenean induced serious damage to the gill lamellae, including clavate lamellae, vascular congestion in the peripheral blood vessels, lamellar blood sinus dilation, and other structural anomalies. Light and transmission electron microscopy showed that in all infested hosts the interlamellar cell mass (ILCM) completely filled the interlamellar space. The monogenean-associated damage combined with the ILCM led to severe impairment of respiratory efficiency of the gill. Anti-parasitic treatment was applied during breeding (hatchery), which was followed by almost complete regression of the ILCM seen in the fish. A single point of ILCM hyperplasia was observed in only one specimen at the site of parasite attachment to the gill filament. The ILCM covering the gill lamellae protected the discus against infestation with this monogenean, but considerable reduction in the gaseous exchange surface and serious damage to the gill lamellae contributed to the increased mortality of the fish in the hatchery, which reached 90%.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The gill monogenean Sciadicleithrum variabilum induces histomorphological alterations in the gill tissues of the discus Symphysodon aequifasciatus

et al. 2022

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Industrial perspective: propagation, phenotypic characteristics, and varieties of the domesticated discus fish (Symphysodon spp.)

Tan

Danish-Daniel

et al. 2023

Aquacult Int

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The pathogenic Asian fish tapeworm, Bothriocephalus acheilognathi Yamaguti, 1934 (Cestoda) in the Red discus (Symphysodon discus)

et al. 2015

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SummaryThe Asian fi sh tapeworm, Bothriocephalus acheilognathi Yamaguti, 1934, was detected for the fi rst time in breeding of discus fi sh Symphysodon discus (Perciformes, Cichlidae), a popular South American cichlid. In examined samples, the adult and juvenile cestodes of B. acheilognathi with mean intensity of infection 30 (range 19 -47) individuals per fi sh were found. The infected fi sh displayed acute behavioral symptoms. Mortality was signifi cant; it reached almost 80 % in youngest age categories. As treatment, praziquantel immersions in dose 2 mg per liter were well tolerated and effi cacious. The risk of spreading pathogens via imported fi sh is actual menace for ornamental breeding fi sh, therefore, thorough quarantine and prophylactic measures needs to be done by all fi sh imports and introductions. Import and subsequent release of infected ornamental fi sh into freshwater ecosystems may represent serious risk for spread and establishment of the parasite in native fi sh species. This case study illustrates that ornamental fi sh play also a key role in national and international movements of parasites in freshwater habitats.

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Early infection of discus Symphysodon aequifasciatus altricial larvae by Sciadicleithrum variabilum (Monogenea)

Abstract: The occurrence of Sciadicleithrum variabilum on the gills of discus Symphysodon aequifasciatus larvae 7 days after hatching is reported for the first time. This suggests that altricial larvae are susceptible to Monogenea following gill differentiation and before complete yolk resorption.

Cited by 5 publications

References 12 publications

The gill monogenean Sciadicleithrum variabilum induces histomorphological alterations in the gill tissues of the discus Symphysodon aequifasciatus

The gill monogenean Sciadicleithrum variabilum induces histomorphological alterations in the gill tissues of the discus Symphysodon aequifasciatus

Industrial perspective: propagation, phenotypic characteristics, and varieties of the domesticated discus fish (Symphysodon spp.)

The pathogenic Asian fish tapeworm, Bothriocephalus acheilognathi Yamaguti, 1934 (Cestoda) in the Red discus (Symphysodon discus)

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