Influence of dietary vegetable crops on rainbow trout (Oncorhynchus mykiss) immune system and growth performance
Sheikhzadeh, Najmeh
Background: Carotenoids such as -carotene, -carotene, lycopene, lutein and -cryptoxanthin are a family of pigmented compounds which are synthesized by many vegetable crops and microorganisms but not animals. In human and murine models, carotenoids are shown to mediate their effects via different mechanisms such as gap junction communication, cell growth regulation, modulating gene expression and immune response. In some fish species, the immunomodulating action of synthetic carotenoids has been the subject of some research. However, studies on the effects of carotenoids from natural sources on fish growth performance and immune parameters are lacking. In the current study, a preliminary study with 60 days feeding was conducted to study the influence of different natural sources of carotenoids from some vegetable crops on growth and some immune indices in rainbow trout (Oncorhynchus mykiss). Materials, Methods & Results: Purified isonitrigenous (crude protein: 40.16%) and isocaloric (3660 kcal kg-1) diet with 4.5 g of powdered crops namely tomato (Solanum lycopersicum) and sweet pepper (Capsicum annuum) per kg feed or control diet without any treatment was prepared. Rainbow trout weighing 150 ± 9 g were distributed equally into 2 groups with 33 fish in each group. Each group contained 11 fish in triplicate reared in individual ponds. In treatment group, fish were fed diet
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