Thyroid function of steatitis-affected Mozambique tilapia Oreochromis mossambicus from a sub-tropical African reservoir
| Autor: | Arno Hugo, Paul J Oberholster, Johan Christian Abraham Steyl, D M Power, Gernot Osthoff, J.H. van Wyk, Jacqueline Dabrowski |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty Oreochromis mossambicus food.ingredient Salvelinus-fontinalis mitchill Endocrine disruption Thyroid Gland Blood lipids Aquatic Science Stress-response Water-quality 03 medical and health sciences Fish Diseases food Internal medicine Blood plasma medicine Animals Obesity South-Africa Olifants River Ecology Evolution Behavior and Systematics Triglycerides Kruger-National-Park Yellow fat disease biology Thyroid Water Lipid metabolism Tilapia 04 agricultural and veterinary sciences biology.organism_classification 030104 developmental biology medicine.anatomical_structure Endocrinology Cholesterol Liver 040102 fisheries 0401 agriculture forestry and fisheries Steatitis Thyroid function Teleost fish Hormone Brook trout |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | Thyroid function and nutritional indicators were measured in obese, steatitis-affected Mozambique tilapia Oreochromis mossambicus from Loskop Reservoir (LR), South Africa. Plasma thyroid hormones (especially T3) and thyroid follicle histomorphology revealed high levels of activity in every aspect of the thyroid cascade measured in fish from LR compared to a reference population of steatitis-free fish. Concurrent measurements of nutritional state including plasma lipids, liver lipid content and hepatocyte size showed that fish from LR had significant energy stores indicative of abundant nutritional intake. There were distinct sex and seasonal differences, with the highest plasma lipids and T3 levels observed in steatitis-affected females during spring and summer. Positive correlations were observed between plasma lipids (especially cholesterol) and T3 concentrations in fish from both populations, indicating a link between lipid metabolism and thyroid function. There was no direct evidence of thyroid disruption, but this cannot be ruled out until further research determines the factors that underlie the homeostatic shift leading to elevated plasma and liver lipids and T3 levels in steatitis-affected tilapia. National Research Foundation (NRF) info:eu-repo/semantics/publishedVersion |
| Databáze: | OpenAIRE |
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