Descripción histológica de la organogénesis en el desarrollo embrionario del pez Guppy Poecilia Reticulata

Abstract

Poecilia reticulata, is a species of the Family Poeciliidae, with a wide geographic distribution from South America, Central America, and South America. They are ovoviviparous fish. With sexual dimorphism, males have a copulatory organ called gonopodium and females have a spot in the abdominal region. Due to internal fertilization, the females of this species have a specific adaptation called superfetation, in which they maintain embryos of different stages in the abdominal region until spawning. The histological description of the embryonic development of Poecilia reticulata is necessary to understand fundamental aspects of the embryology, biology and reproduction of ovoviviparous fishes. This research study focused on the histological observation of organogenesis during the embryonic development of Poecilia reticulata, focusing on the development and detailed description of the characteristic organs of each stage, five embryonic stages were described histologically, using protocols with hematoxylin and eosin, achieving the observation of tissue and organ outlines. This description was carried out by means of the analysis under microscope of histological cotes assemblies made in the histopathology laboratory of the National University of Colombia. The main findings were the description of the swim bladder Where gas glands were observed and the presence of rete mirabile; and in the hepatopancreas, its pancreatic and hepatic components were recorded. This paper postulates the importance of organogenesis in Poecilia reticulata as a significant model for developmental biology, as well as its relevance to aquaculture and species conservation.