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Images: A Big Decline of River Herring

WHOI biologist Joel Llopiz is investigating critical gaps in understanding river herring's larval stage just after they hatch. (Joel Llopiz, Woods Hole Oceanographic Institution)
WHOI biologist Joel Llopiz holds a vial containing tiny larvae of river herring. He is studying the factors that affect the growth and survival of fish larvae, about which surprisingly little is known. (Matt Barton, Woods Hole Oceanographic Institution)
Sara Hamilton (left), a WHOI Summer Student Fellow. and WHOI lab assistant Julie Pringle collect specimens of river herring for research. (Tom Kleindinst, Woods Hole Oceanographic Institution)

A magnified image of a fish otolith, a tiny calcium carbonate deposit in their heads. A new layer grows each day around otoliths, so scientists use them to study how fish grow and develop.

(Joel Llopiz, Woods Hole Oceanographic Institution)
River herring used to run up coastal streams in great numbers in springtime, returning from the ocean to spawn in fresh water. (Joel Llopiz, Woods Hole Oceanographic Institution)
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