Eye fluke effects on Danish freshwater fish: Field and experimental investigations

Duan, Yajiao; Jørgensen, Louise von Gersdorff; Kania, Per W.; Karami, Asma M.; Al‐Jubury, Azmi; Buchmann, Kurt

doi:10.1111/jfd.13496

Cited by 9 publications

(6 citation statements)

References 94 publications

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“…In June 2021, we selected an infected Lymnaea stagnalis pulmonate snail (morphological identification according to Glöer [ 23 ] out of 205 snails collected in the lake Bagsværd sø (55°46’16.0566", 12°27’39.6864") (Zealand, Eastern part of Denmark). Snails were allocated in individual 100-ml beakers with filtered (0.45μm) lake water for subsequent shedding procedures [ 24 ]. All beakers were then examined under the stereomicroscope; among them, two snails shed diplostomid cercariae.…”

Section: Methodsmentioning

confidence: 99%

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Responses towards eyefluke (Diplostomum pseudospathaceum) in different genetic lineages of rainbow trout

Karami

Duan²,

Kania³

et al. 2022

PLoS ONE

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Marker-assisted selective breeding of fish with higher levels of resistance towards specific pathogens may improve fish health, but the impact of host genotype on susceptibility to multiple pathogen infections is still poorly investigated. This study examined the resistance in rainbow trout Oncorhynchus mykiss towards infection with the eye fluke Diplostomum pseudospathaceum. We used genetically selected rainbow trout, carrying SNPs associated with resistance towards the parasitic ciliate Ichthyophthirius multifiliis, and exposed the fish to eye fluke cercariae. We showed that fish partly resistant to I. multifiliis were more susceptible to eye fluke invasion. The expression of immune relevant genes (encoding innate and adaptive factors) was also affected as these genotypes responded less strongly to a secondary fluke infection. The complexity of genome architecture in disease resistance towards multiple pathogens is discussed.

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Section: Methodsmentioning

confidence: 99%

“…All beakers were then examined under the stereomicroscope; among them, two snails shed diplostomid cercariae. These were preserved in ethanol (96%) for molecular identification, including PCR and sequencing, according to Duan et al [ 24 ]. Isolated cercariae were identified as D .…”

Section: Methodsmentioning

confidence: 99%

Responses towards eyefluke (Diplostomum pseudospathaceum) in different genetic lineages of rainbow trout

Karami

Duan²,

Kania³

et al. 2022

PLoS ONE

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“…Representative genera are Diplostomum and Tylodelphys, parasites occupying the lens and corpus vitreum of the fish host, respectively. These eye flukes may severely affect vision (Duan et al, 2021), whereas other species reach maturity in mammals including humans and are thus regarded as serious zoonotic pathogens. Classic examples are Clonorchis, Opisthorchis, Metagonimus, Haplorchis, Centrocestus and Pseudamphistomum where the most effective control methods established rely on snail control in ponds and the control of infective stages in inlet water (Skov et al, 2008(Skov et al, , 2009Madsen et al, 2022).…”

Section: Problematic Digeneansmentioning

confidence: 99%

A century of parasitology in fisheries and aquaculture

Timi

Buchmann

2023

J. Helminthol.

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Fish parasitological research associated with fisheries and aquaculture has expanded remarkably over the past century. The application of parasites as biological tags has been one of the fields in which fish parasitology has generated new insight into fish migration and stock assessments worldwide. It is a well-established discipline whose methodological issues are regularly reviewed and updated. Therefore, no concepts or case-studies will be repeated here; instead, we summarize some of the main recent findings and achievements of this methodology. These include the extension of its use in hosts other than bony fishes; the improvements in the selection of parasite tags; the recognition of the host traits affecting the use of parasite tags; and the increasingly recognized need for integrative, multidisciplinary studies combining parasites with classical methods and modern techniques, such as otolith microchemistry and genetics. Archaeological evidence points to the existence of parasitic problems associated with aquaculture activities more than a thousand years ago. However, the main surge of research within aquaculture parasitology occurred with the impressive development of aquaculture over the past century. Protozoan and metazoan parasites, causing disease in domesticated fish in confined environments, have attracted the interest of parasitologists and, due to their economic importance, funding was made available for basic and applied research. This has resulted in a profusion of basic knowledge about parasite biology, physiology, parasite–host interactions, life cycles and biochemistry. Due to the need for effective control methods, various solutions targeting host–parasite interactions (immune responses and host finding), genetics and pharmacological aspects have been in focus.

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“…Eyefluke infections in fish are caused by infective cercariae, released from intermediate host snails, penetrating the surfaces of fish skin, fins or gills (Duan et al ., 2021 ). If these cercariae cannot be eliminated by chemicals or mechanical filtration of water (Larsen et al ., 2005 ) it is possible to remove the intermediate host snails simply by collecting snails from ponds.…”

Section: Mechanical Controlmentioning

confidence: 99%

Control of parasitic diseases in aquaculture

Buchmann

2022

Parasitology

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Finfish aquaculture in freshwater and marine environments is continuously expanding globally, and the potential for a substantial further increase is well documented. The industry is supplying fish products for human consumption to the same extent as capture fisheries, and new fish species for domestication are still being selected by the industry. The challenge faced by all aquacultured species, classical and novel, is the range of pathogens associated with each new fish type. A fish host in its natural environment carries a series of more or less specific parasites (specialists and generalists). Some of these show a marked ability to propagate in aquaculture settings. They may then elicit disease when infection intensities in the confined aquaculture environment reach high levels. In addition, the risk of transmission of parasites from aquaculture enterprises to wild fish stocks adds to the parasitic challenge. Control programmes of various kinds are needed and these may include chemotherapeutants and medicines as the farmer's first and convenient choice, but mechanical, biological, immunological and genetic control methods are available solutions. New methods are still to be developed by scrutinizing the life cycle of each particular parasite species and pin-pointing the vulnerable stage to be targeted. As parasites exhibit a huge potential for adaptation to environmental changes, one must realize that only one approach rarely is sufficient. The present work therefore elaborates on and advocates for implementation of integrated control strategies for diseases caused by protozoan and metazoan parasites.

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Eye fluke effects on Danish freshwater fish: Field and experimental investigations

Cited by 9 publications

References 94 publications

Responses towards eyefluke (Diplostomum pseudospathaceum) in different genetic lineages of rainbow trout

Responses towards eyefluke (Diplostomum pseudospathaceum) in different genetic lineages of rainbow trout

A century of parasitology in fisheries and aquaculture

Control of parasitic diseases in aquaculture

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