Health issues in RAS bred African catfish (Clarias gariepinus)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027162%3A_____%2F24%3AN0000224" target="_blank" >RIV/00027162:_____/24:N0000224 - isvavai.cz</a>

Result on the web

<a href="https://eafp.org/the-1st-meeting-of-the-central-and-eastern-european-eafp-branch-2nd-announcement/" target="_blank" >https://eafp.org/the-1st-meeting-of-the-central-and-eastern-european-eafp-branch-2nd-announcement/</a>

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Health issues in RAS bred African catfish (Clarias gariepinus)

Original language description

Toulová, I., Mikulíková, I., Papežíková, I., Novotná, H., Dyková, I., Palíková, M., 2024. Health issues in RAS bred African catfish (Clarias gariepinus). The 1st Meeting of the Central and Eastern European EAFP Branches, Abstract Book, European Association of Fish Pathologists, Křtiny, Czech Republic, 4.–6. 12. 2024, p. 35. ISBN 978-80-7701-005-4. The aim of the study was to examine the health status of farmed African catfish (Clarias gariepinus). The health assessment was conducted on three farms (two in the Czech Republic and one in the Slovak Republic). All farms use recirculating aquaculture systems. On each farm, at least 10 fish were sampled and subjected to the anatomical-pathological examination, haematological examination, parasitological examination of the gills and skin, bacteriological cultivation and histological examination of the gills, kidneys (head and trunk), liver and spleen. On the first farm, skin lesions were observed in several fish, some of them (size approx. 3×4 cm) exposing the muscles and the head kidney. Additionally, there were small haemorrhages in the skin and fluid in the body cavity. Bacteriological cultivation proved high concentrations of Aeromonas veronii in one fish and Aeromonas hydrophila in another. Histological assessment showed a severe form of alteration in the kidneys (in 11 fish out of 28) and lamellar atrophy of gills, which were infected by Monogenea of Quadricanthus sp. No macroscopic pathological changes were found by the necropsy of fish from the second farm. Bacteriological cultivation confirmed common bacteria on the gills (Aeromonas caviae, Aeromonas veronii, Shewanella putrefaciens, Shewanella profunda, Citrobacter freundii, Hydrogenophaga pseudoflava and Proteus sp.). Histological examination revealed granulomatous lesions in the head and trunk kidney of two fish. On the third farm, organs of three fish showed macroscopic changes (atypical coloration of the organs, haematomas in the liver and nodular structures in the kidneys). Bacteriological cultivation proved only common bacteria on the gills (Acinetobacter junii, Arthrobacter sp., Xanthomonas sp., Flavobacterium hibernum, Flavobacterium flevense, Aeromonas hydrophila, Pseudomonas spp., Sphingomonas sp., Chryseobacterium sp. and Sphingomonas sp.). Relatively small foci of macrovesicular steatosis in the liver were detected by histological examination in five fish. Serious health problems were revealed in the fish from the first farm, including changes in the organs, skin lesions and haemorrhages. No serious pathological changes were found in the fish from the second farm. Minor organ changes were revealed in several fish from the third farm.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

40301 - Veterinary science

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů