"Fish eggs" refers to the eggs or small round balls laid by fish in the water. They are also known as roe. People sometimes eat these eggs as a delicacy, especially from certain fish species like caviar. Full definition
This work is groundbreaking as it determines the complete composition of fish egg communities, which could contain more than a dozen species. (sciencedaily.com)
Also, you may want to contact the company of a brand you like to get if you are buying fish eggs in jars. (cheeseslave.com)
Birds, too, could have inadvertently transferred fish eggs from one pool to another. (sciencemag.org)