Macroscopically visible lipid deposition varying in size from pinpoint to 8-mm diameter was found in spleens of a population of intensively farmed perch, Perca fluviatilis L. over a 24-month rearing period. Large agglomerates of adipocytes distinguishable from surrounding normal tissue occurred in all individuals with spleen lipidosis. Several affected fish presented total dystrophy of large clusters of hepatocytes. Prevalence of lipidosis was 5.0% at 12 months and 16.6% at 24 months. There was no significant difference between fatty acid profiles of liver or perivisceral fat of perch with and without lipidosis except for linoleic, myristic, γ-linoleic, cis-eicosatrienic, palmitooleic acid. Body weight and hepatosomatic, perivisceral fat and splenosomatic indices were not associated with lipidosis. There was no significant effect of lipidosis on mortality or growth.

Faculty of Veterinary Hygiene and Ecology Veterinary Public Health and Animal Welfare University of Veterinary and Pharmaceutical Sciences Brno Brno Czech Republic

South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses Institute of Aquaculture Faculty of Fisheries and Protection of Waters University of South Bohemia in Ceske Budejovice Ceske Budejovice Czech Republic

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Partially Defatted Hermetia illucens Larva Meal in Diet of Eurasian Perch (Perca fluviatilis) Juveniles