Study finds that eDNA can help detect rainbow smelt
Searun rainbow smelt—a culturally and ecologically valuable fish for New England anglers, consumers and marine ecosystems—is on the decline. Determining the extent of that decline, however, is difficult in Maine. Searun smelt can be easy to miss because they only enter coastal spawning streams from deeper waters during a few cold, wet nights each spring, and they depart the streams by early morning.
source: Phys.org