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Nat Prod Res. 2018 Dec 23:1-11. doi: 10.1080/14786419.2018.1538994. [Epub ahead of print]

The oak (Quercus brantii) acorn as a growth promotor for rainbow trout (Oncorhynchus mykiss): growth performance, body composition, liver enzymes activity and blood biochemical parameters.

Author information

1
a Young Researchers and Elite Club, Khorramabad Branch , Islamic Azad University , Khorramabad , Iran.
2
b Department of Fisheries, Faculty of Agriculture and Natural Resources , Universiy of Gonbad Kavoos.
3
c Young Researchers and Elite Club, Urmia Branch , Islamic Azad University , Urmia , Iran.
4
d Department of Physiology , Institute for Biological Research Siniša Stanković, University of Belgrade , Belgrade , Serbia.
5
e Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina Viale Ferdinando Stagno d'Alcontres , S. Agata , Messina , Italy.

Abstract

Medicinal plants play an important role in aquaculture as feed additives. This study aimed to investigate effects of alcoholic extract of acorn on growth performance, body composition, digestive enzymes activity and blood biochemical parameters of rainbow trout (O. mykiss) as a commercially important fish. Five dietary treatments were supplemented: 100, 200, 400 and 600 mg.kg-1 of the extract. Fishes were fed twice per day for 8 weeks, and results showed that acorn extract positively affected all investigated parameters in rainbow trout fishes. Digestive enzymes activity and growth performance were increased, while activity of liver enzymes and cortisol were lowed in comparison to control individuals. Body composition of treated animals was also enhanced. Comparison between treated groups together with integrative biomarker response (IBR) values indicated greatest effects in animals fed with 400 and 600 mg.kg-1 of the extract. Positive effects of the acorn represent promising start point for further studies.

KEYWORDS:

Health status; growth performance; liver enzymes activity; medicinal plants; oak; protective effects; rainbow trout

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