Will herring spawn again in the Mill Brook?

The Mill Brook in West Tisbury is a tiny facsimile of the major rivers along the Atlantic and Pacific coasts, but it was once an open waterway used by migrants like herring, eels, and sea-run brook trout. The dam at the foot of the Mill Pond is one of several manmade obstructions along the brook, but it is the most important one in terms of extending the spawning grounds of herring and the living grounds of American eels, which spawn at sea.