Long Pond hosts a robust river herring spawning event each spring. In early April, thousands of ocean-dwelling herring swim up the “Centerville River,” an artificial stream that enters Long Pond between Blantyre Avenue and Holly Lane. You can see the white sandbags that Town of Barnstable herring wardens use to regulate flow into the run, to keep adequate but not too much water for the herring passage. On the north shore, there is a white bridge over the run where it passes on up to Lake Wequaquet.
The small energetic fish struggle upstream and against a host of predators to reach their spawning grounds here, staying four to six weeks before returning to their ocean home. The fry may remain in Long Pond until autumn, and schools can sometimes be seen in the shallow water. There can be millions, as each female herring releases as many as 100,000 eggs. Only 1% or fewer survive to return to spawn here at age three or older. If they are fortunate, the adult fish can spawn more than once, unlike salmon.
A handful of dedicated volunteers count the herring as they swim by. We follow the protocol given by the MA Department of Marine Fisheries, designed to extrapolate from limited data to an actual count. In 2021, we counted 10,000 in our limited counts, and DMF calculated an actual count of 200,000. Last year we also counted 10,000. This year the count was down to 5,000 – a common finding in most of Massachusetts’ 100 herring runs. DMF folks think that ocean fishing trawlers may be inadvertently capturing them and discarding them as ‘bycatch.’ Or perhaps their food supply is down this year.
No one knows what portion of our herring spawn here and what portion goes on up to Lake Wequaquet. Many do go on up. The alewife herring, who arrive first, spawn quietly in the Pond, but the blueback herring, who arrive a week later than the alewife, spawn in the moving water of the run. It is glorious to watch their enthusiasm and joy as they do this.
Most of our herring population arrives in the hours before or at dawn. Few pass in daylight hours, although that is when DMF tells us to count. We need volunteers to meet this mandate. There are few places to count on public property. Currently we use 125 Blantyre Avenue, along the run, for counting. If you would like to help, or to come by at dawn and see some herring next spring, please contact Steve Waller at stevegwaller@gmail.com.