Here's some Rainbowfish egg photos at various stages of development.
Clear to amber = Fertile
White = Infertile
"Eyed up" means they are far enough along in development that we can see their eyes.
Rainbowfish eggs are Tiny. For size reference---there are photos of eggs on standard size acrylic yarn spawning mops. Eggs on aquatic plants and plant roots--it is very difficult to view eggs on plants while plants are in the aquarium, so the plants were removed from the water in search of eggs and to take photos. One photo is of a toothpick with eggs on it for size reference. Hope this helps people when they're 1st looking for eggs.
Most of the strands you see around the eggs are just fibers from the yarn. In some egg/plant photos, you can see clear threads...those are actually the adhesive threads that are attached to the eggs when released by the female. The strands are sticky, and help the eggs adhere to stuff while the egg develops.