Physiological and ion changes of Nile tilapia (Oreochromis niloticus) under the effect of salinity stress
Autor: | Michel Fahmy Saad, Omaima Nasif, Mustafa Shukry, Nesreen A. Mohamed, Hien Van Doan, Mahmoud A.O. Dawood, Abeer M.S. El-Keredy |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Gill
Histology Aquatic Science Salinity stress lcsh:Aquaculture. Fisheries. Angling 03 medical and health sciences Nile tilapia chemistry.chemical_compound Animal science Carbonic anhydrase 030304 developmental biology lcsh:SH1-691 0303 health sciences Triiodothyronine biology Acid-base balance Chemistry Respiration capacity 04 agricultural and veterinary sciences Environmental stressors biology.organism_classification Malondialdehyde Salinity Oreochromis 040102 fisheries biology.protein 0401 agriculture forestry and fisheries Animal Science and Zoology Gene expression |
Zdroj: | Aquaculture Reports, Vol 19, Iss, Pp 100567-(2021) |
ISSN: | 2352-5134 |
Popis: | Nile tilapia (Oreochromis niloticus) is a well-known economic fish species and can grow well under optimum environmental conditions. However, stressful rearing conditions are expected to deteriorate the performance and health condition of fish. Hence, the present study investigated the physiological and ion changes of Nile tilapia under salinity stress. Fish of 200 ± 20 g were divided into three groups where the control group reared in water with 0 ppt salinity, while the second and third groups were raised in water with low salinity (10 ppt) and high salinity (15 ppt), respectively. Blood dissolved oxygen and gases (pH, PO₂, PCO₂, TCO₂, and HCO₃⁻) significantly differed in different groups after 5 and 10 days (P < 0.05). The salinity stress affected the Hb, PCV, Na⁺, K⁺, Ca⁺⁺, and lactate significantly (P < 0.05). Serum cortisol, triiodothyronine, and free triiodothyronine concentrations after 5 and 10 days were significantly affected (P < 0.05) in salinity stressed groups compared to the control group. Serum malondialdehyde showed a significant increase (P < 0.05) after 5 days in the stressed groups, then became non-significant after 10 days compared to the control group. The relative gene expression of Na⁺-K⁺-ATPase and cytosolic carbonic anhydrase were significantly upregulated in salinity stressed groups (P < 0.05). The histopathological images of Nile tilapia exposed to high salinity stress revealed damage in gills, liver, and kidney tissues, which confirmed the harmful effects of increased salinity. Thus, the obtained results demonstrated that the adverse effects of high salinity stress on the health status of Nile tilapia. |
Databáze: | OpenAIRE |
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