Clinical and histopathological changes in rainbow trout Oncorhynchus mykiss experimentally infected with fungus Bradymyces oncorhynchi

Řehulka, Jiří; Kolařík, Miroslav; Hubka, Vít

doi:10.1007/s12223-020-00813-5

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…Blood biomarkers profiling in salmonids has been used most frequently in the characterization of infectious diseases, defining and quantifying systemic functional profiles such as liver, renal, cardiac, pancreatic and other functions [ 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 ]. Furthermore, the number and percentages of the different types of leukocytes present have been demonstrated to change in response to infection and stress in salmonids [ 29 , 30 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 ].…”

Section: Discussionmentioning

confidence: 99%

Reference Intervals for Blood Biomarkers in Farmed Atlantic Salmon, Coho Salmon and Rainbow Trout in Chile: Promoting a Preventive Approach in Aquamedicine

Rozas‐Serri¹,

Correa²,

Walker-Vergara³

et al. 2022

Biology

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The mission of veterinary clinical pathology is to support the diagnostic process by using tests to measure different blood biomarkers to support decision making about farmed fish health and welfare. The objective of this study is to provide reference intervals (RIs) for 44 key hematological, blood biochemistry, blood gasometry and hormones biomarkers for the three most economically important farmed salmonid species in Chile (Atlantic salmon, coho salmon and rainbow trout) during the freshwater (presmolt and smolt age range) and seawater stages (post-smolt and adult age range). Our results confirmed that the concentration or activity of most blood biomarkers depend on the salmonid species, age range and/or the interaction between them, and they are often biologically related to each other. Erythogram and leukogram profiles revealed a similar distribution in rainbow trout and coho salmon, but those in Atlantic salmon were significantly different. While the activity of the most clinically important plasma enzymes demonstrated a similar profile in Atlantic salmon and rainbow trout, coho salmon demonstrated a significantly different distribution. Plasma electrolyte and mineral profiles showed significant differences between salmonid species, especially for rainbow trout, while Atlantic salmon and coho salmon demonstrated a high degree of similarity. Furthermore, electrolytes, minerals and blood gasometry biomarkers were significantly different between age ranges, suggesting a considerably different distribution between freshwater and seawater-farmed fish. The RIs of clinically healthy fish described in this study take into account the high biological variation of farmed fish in Chile, as the 3.059 individuals came from 78 different fish farms, both freshwater and seawater, and blood samples were collected using the same pre-analytical protocol. Likewise, our study provides the Chilean salmon farming industry with standardized protocols that can be used routinely and provides valuable information to improve the preventive vision of aquamedicine through the application of blood biomarkers to support and optimize health, welfare and husbandry management in the salmon farming industry.

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Section: Discussionmentioning

confidence: 99%

Reference Intervals for Blood Biomarkers in Farmed Atlantic Salmon, Coho Salmon and Rainbow Trout in Chile: Promoting a Preventive Approach in Aquamedicine

Rozas‐Serri¹,

Correa²,

Walker-Vergara³

et al. 2022

Biology

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show abstract

“…many of the categories identified by us and described them as degenerative changes. A tendency to the formation of BNc was observed in rainbow trout experimentally infected with the hyphae of Bradymyces oncorhynchi (Řehulka et al., 2020). The BNc observed by us were previously described by Smith (1968) in young coho salmon ( Oncorhynchus kisutch ) and Cowey and Woodward (1993) in young rainbow trout deficient in folic acid.…”

Section: Discussionmentioning

confidence: 98%

Study of the frequencies of erythrocyte abnormalities as in situ biomarkers of genotoxic risk of chemicals in special fish stock in water supply reservoirs

Řehulka,

Bradík

2023

Journal of Fish Diseases

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In three water‐supply reservoirs in the catchment area of the Odra River (Czech Republic), a special fish stock was monitored for control of health to estimate the mutagenic effect of chemicals. The results contribute to obtaining initial information about the morphology of erythrocyte abnormalities classified in 21 categories in 17 fish species in reservoirs with abundant salmonids (the Morávka Reservoir) or with the prevalence of cyprinids (the Kružberk and Šance Reservoirs), not directly exposed to the adverse environmental effects such as industrial, urban, agricultural and intensive farming activities. The different intensities and prevalence of nuclear abnormalities (NA) and cytoplasmic abnormalities (CA) in fish from the same reservoir habitat show that to be able to obtain an objective view of the genotoxic risk of chemicals, it is necessary to respect the different requirements of the fish for the exploitation of the food available in the biotope and to subject all representatives of piscivorous, omnivorous and benthophagous fishes in the reservoir to cytogenetic analysis. The occurrence of certain categories of erythrocyte abnormalities in diseased fish draws attention to the need to know the state of health of the fish and to employ this knowledge to exclude parasitological, viral and other infectious agents. These results are the first report of the frequencies of erythrocyte abnormalities in native fish. They should serve to check which of the categories examined could be of use in assessing the genotoxic risk in other stagnant and running aquatic ecosystems affected by anthropogenic activities.

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“…In salmonid aquaculture there is a trend of increasing incidence of visceral mycotic infections in farmed rainbow trout. The spectrum of primary etiological agents of serious health disorders also expanded in the last years [ [1] , [2] , [3] ].…”

Section: Introductionmentioning

confidence: 99%

Clinical and histopathological changes in rainbow trout Oncorhynchus mykiss experimentally infected with fungus Bradymyces oncorhynchi

Cited by 4 publications

References 25 publications

Reference Intervals for Blood Biomarkers in Farmed Atlantic Salmon, Coho Salmon and Rainbow Trout in Chile: Promoting a Preventive Approach in Aquamedicine

Reference Intervals for Blood Biomarkers in Farmed Atlantic Salmon, Coho Salmon and Rainbow Trout in Chile: Promoting a Preventive Approach in Aquamedicine

Study of the frequencies of erythrocyte abnormalities as in situ biomarkers of genotoxic risk of chemicals in special fish stock in water supply reservoirs

A visceral mycosis in farmed rainbow trout (Oncorhynchus mykiss) caused by Neopyrenochaeta submersa

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