
How tiny coral reef fish larvae locate the reef habitat across vast expanses of water has remained an enduring mystery. An innovative observational tool, the OWNFOR (Orientation With No Frame Of Reference) designed by UM Rosenstiel School researchers, is breaking new ground by allowing scientists to detect and quantify the orientation of larval coral reef fish in the pelagic environment; an often pitch black void with little or no frame of reference to navigate. Credit: Evan D'Alessandro One of the most significant questions facing marine ecologists today, is just how much of an impact global variations in the environment are having on the dispersal of larval and juvenile marine species from open oceans to coral reefs. Previously, tracking how fish larvae migrate was done through direct observation by divers on older larvae found near the reefs, after they’d spent weeks to months in the plankton. This method did not permit divers to follow small larvae, diving larvae or larvae as they returned to the reefs at night. How tiny coral reef fish larvae locate the reef habitat across vast expanses of water has remained an enduring mystery.