The phrase "fish embryos" refers to the early stages of a fish's development before it hatches from its egg. It represents the baby fish inside the egg that is not yet fully formed and ready to swim. Full definition
Previous work in this area involved slicing thin sections of fish embryos to chart organ growth. (sciencedaily.com)
Recent studies on species such as zebrafish showed scales and teeth developing from distinctly different clusters of cells in fish embryos, pouring cold water on «teeth from scales» theories. (sciencedaily.com)
In another study, scientists at the University of Utah found that nanoscopic particles of silver used as an antimicrobial in hundreds of products, including jeans, baby bottles, and washing machines, can deform fish embryos. (discovermagazine.com)