Scientists Uncover How Fish Embryos Choose Their Hatch Date
Researchers from Hebrew University of Jerusalem have discovered that fish embryos, such as those of zebrafish and medaka, can control their hatching time by releasing thyrotropin-releasing hormone (Trh), which triggers enzymes to dissolve the egg wall. This process allows embryos to hatch under optimal environmental conditions, enhancing survival. The study highlights the evolutionary significance of this mechanism, which is shared by distantly related species, and suggests further research into how climate change might affect these hatching strategies.