An Ovary of the Live-Bearing Placental Fish, Poeciliopsis prolifica (image) University of California - Riverside Share Print E-Mail Caption An ovary of the live-bearing placental fish, Poeciliopsis prolifica. At image center is a late stage embryo with the network of blood vessels of the placenta. In the background are a one-cell embryo and embryos at earlier stages. Credit Image courtesy of Michael O'Neill, University of Connecticut. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.