NUTRITION STAGES ACCORDING TO THE HISTOLOGICAL DESCRIPTION OF THE INTESTINE IN GUPPY FISH oecilia reticulate

The nutrition stages in the guppy fish were divided into three main stages according to thehistological changes:1- Endogenous nutrition stage characterized by the embryo wassticked on the surface of yolk sac which has vacuoles in the periphery part of it.2- Mixed nutrition stage characterized by the small mount of yolk found in the abdominal cavitydespite of the disappearance of yolk sac, and food was found inside the intestine lumen andlarge mount of fat vacuoles were found in the supranuclear position of cells of lining epitheliumof intestine.3- Exogenous nutrition stage characterized by the disappearance of yolk sac and little yolk wasfound in the abdominal cavity and food was found inside the intestine lumen and by thedisappearance of fat vacuoles from supranuclear position of cells of lining epithelium ofintestine.