Morphomechanical study on the changes taking place in the course of the embryonic development of the bleak (Alburnus alburnus L. ) conducted on tlle live fish in vertical and horizontal light beams. revealed that the oocyte (yolk mass) occupies some 30% of the entire egg′s volume. while the remaining 70% is occupied by the perivitelline space. https://foldlyers.shop/product-category/firewire/