For hardware description language file, see VHDL. VHD (Virtual Hard Disk) is a file format which represents a virtual hard disk drive (HDD). It may contain what is found on a physical HDD, such as disk partitions and a file system, which in turn can contain files and folders. It is typically used as the hard disk of a virtual machine.
Typically, koi eggs will hatch in less than a week. Koi eggs are very small, bead-like specks that can vary from milky white to yellow or green. Upon closer inspection, you can see two black dots through the transparent membrane of the egg. These are the developing eyes of the koi.
Answer Wiki. Eggs Of the koi fish are adhesive in nature and once the female releases the egg in the aquatic environment the male releases the semen in order to fertilize . After the fertilization the egg attaches to the peripheral substratum like grass, weeds etc. Incubation period varies from 36 to 48 hours.