Nutrition stages according to the histological description of the intestine in guppy fish Poecilia reticulate

الملخص EN

The nutrition stages in the guppy fish were divided into three main stages according to the histological changes: 1- Endogenous nutrition stage characterized by the embryo was sticked 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 cavity despite of the disappearance of yolk sac, and food was found inside the intestine lumen and large mount of fat vacuoles were found in the supranuclear position of cells of lining epithelium of intestine.

3- Exogenous nutrition stage characterized by the disappearance of yolk sac and little yolk was found in the abdominal cavity and food was found inside the intestine lumen and by the disappearance of fat vacuoles from supranuclear position of cells of lining epithelium of intestine.