Ultrastructure of the fertilized egg envelopes in Hemigrammus erythrozonus, Characidae, Teleostei.We examined the morphology and ultrastructures of fertilized egg envelopes of glowlight tetra (Hemigrammus erythrozonus) belong to Characidae using light and electron microscopes.The fertilized eggs were spherical, transparent, demersal, adhesive, and have no oil droplet. 
electron microscopes