Inorganic mercury and dietary safe feed additives enriched diet impacts on growth, immunity, tissue bioaccumulation, and disease resistance in Nile tilapia (Oreochromis niloticus).

Autor: Ayyat MS; Animal Production Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt. Electronic address: ayyatm@yahoo.com., Ayyat AMN; Department of Fish Nutrition and Feed Technology, Central Laboratory for Aquaculture Research, Abassa, Abu Hammad, Sharkia, Egypt., Abd El-Latif KM; Specialized Hospital, Ain Shams University, Cairo, Egypt., Hessein AAA; Department of Fish Nutrition and Feed Technology, Central Laboratory for Aquaculture Research, Abassa, Abu Hammad, Sharkia, Egypt., Al-Sagheer AA; Animal Production Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt.
Jazyk: angličtina
Zdroj: Aquatic toxicology (Amsterdam, Netherlands) [Aquat Toxicol] 2020 Jul; Vol. 224, pp. 105494. Date of Electronic Publication: 2020 May 11.
DOI: 10.1016/j.aquatox.2020.105494
Abstrakt: Little is known about the impacts of dietary exposure to inorganic mercury (Hg) for a long duration on the health indicators, growth, and disease resistance in Oreochromis niloticus. Accordingly, the current study was designed to assess the effects of Hg contaminated diets on blood biochemistry, growth, chemical composition, Hg bioaccumulation in the tissues, histopathology of liver and head kidneys, and disease resistance to Aeromonas hydrophila of O. niloticus. Also, the efficiency of citronella oil, geranium oil (GO), curcumin (CUR), Bacillus toyonensis (BT), and Bacillus subtilis (BS) as dietary supplements on reversing the negative impacts of Hg were assessed. A total of 240 tilapia fingerlings were assigned to eight dietary treatments fed on the basal diet (G1), G1 diet contaminated with 50 ppm Hg (G2), whereas the other groups fed the G2 diet and enriched with 400 mg CO (G3), 400 mg GO (G4), 200 mg CUR (G5), 7 × 10 7 cells BT (G6), 7 × 10 7 cells BS (G7), and 7 × 10 7 BT + BS/ kg diet (G8) for 16 weeks. The obtained results showed that fish fed on the G2 diet had significantly impaired growth performance indicators, blood parameters, and resistance to bacterial infection compared with fish in the control group. Additionally, distinct pathological perturbations in liver and head kidneys were observed. In contrast, fish groups G3 to G8 had a significant enhancement in the growth performance, Hg bioaccumulation in fish tissues, blood biochemistry, and resistance against A. hydrophila infection compared with fish in the G2 group. Maximum improvement was recorded in G5, G6, and G8. Conclusively, from both health and an economic point of view, these results suggested that several benefits might be gained by adding these additives, especially CUR, BT, and BT + BS, on growth enhancement and ameliorating Hg negative impacts in O. niloticus.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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