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Ultrastructure of the Fertilized Egg Envelope from Hyphessobrycon serpae, Characidae, Teleost  

Kim, Dong-Heui (Dept. of Basic Science, Wonju College of Medicine, Yonsei University)
Deung, Young-Kun (Dept. of Basic Science, Wonju College of Medicine, Yonsei University)
Lee, Kyu-Jae (Dept. of Parasitology and Institute of Basic Medical Science, Yonsei University)
Publication Information
Applied Microscopy / v.35, no.2, 2005 , pp. 89-96 More about this Journal
Abstract
The ultrastructures of the fertilized egg envelope from Hyphessobrycon serpae belonging to Characidae was studied using scanning and transmission electron microscopes to get systematic fundamental data for classification of species and to confirm whether micropyle is a common trait of Characidae or not. The fertilized egg was of colorless, transparent, spherical, adhesive and demersal type. There were not oil droplets in vitelline membrane and attached structures in the outside of fertilize egg envelope. The egg envelope had a single micropyle resembling the pathway of sperm in the area of the animal pole. The micropyle was surrounded by 13 to 15 protruded lines of the egg envelope in a radiated form. The outer surface of fertilized egg envelope was covered by reticular adhesive fibrous structures and irregularly arranged by pore canals. The fertilized egg envelope consisted of three distinct layers an outer adhesive fibrous layer with high electron density, a middle layer with pore canals, and an inner layer consisting of 6 to 7 lamellae alternating layers with interlamellae of lower electron density. These ultrastructural characters of fertilized egg envelope form Hyphessobrycon serpae can be utilized in taxonomy of teleost, and as fundamental data for study on early development of fertilized egg. It seems that the morphology of micropyle is a common trait of Characidae
Keywords
Fertilized egg envelope; Fish; Hyphessobrycon serpae; Ultrastructure;
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