Photo and caption by George Novak
The seven days old jelly like trout embryo's heart is beating already. The eyes just started to develop, it's coloration is getting more obvious. The thickness of the skull would be around 450 microns, less than half a millimeter. The little "creature" floats in a nutrient rich liquid. The little bubbles are actually fish oil. After an hour battle I managed to peel the embryo out from the 5mm egg to take the photo. 10x optical magnification with the object area of 2 x 1.2 mm. At this developmental stage even the smallest vibration can kill the embryo inside the egg.
Location: Rotorua, Bay of Plenty, New Zealand