Essential Insights
- A cold, unusually fresh-water pulse swept down the Northeast shelf from the Grand Banks in 2023, making waters 5–9°F colder than average by 2024.
- Squid arrived weeks late: longfin squid missed their usual early-summer window, and 2024 landings fell 25.6% from the year before.
- Fishers spotted the disruption first. Their “Squid Squad” calls and boat-based ocean measurements helped scientists track the event.
- What drove the pulse remains unclear. A south-shifted Gulf Stream and changing winds may both have played a role,researchers say more study is needed.
A cold pulse rewrote the season
Squid usually reach southern New England in May and remain through July. In 2024, they arrived in August. Fishers had noticed the change: squid catches fell, while cold-water mackerel returned.
Researchers linked the disruption to an unusually cold, fresh pulse that moved south from waters near Newfoundland. In May, surface salinity in one long-running monitoring area hit its lowest level in 11 years. Across much of the Northeast shelf, water ran 5 to 9 degrees Fahrenheit below the 20-year average.
Crews helped spot the shift
The change affected more than timing. Longfin squid landings fell 25.6% from 2023 to 2024, dropping from 39 million pounds to 29 million. Their value also declined, from $39 million to $32.5 million.
Fishing crews shared observations in regular calls and took ocean readings from their boats. Researchers combined those records with ship surveys and satellite data. That teamwork shows how practical experience can flag a problem before a formal survey captures its full reach.
Useful warning, unfinished forecast
Scientists still cannot say what drove the cold pulse. A southward shift in the Gulf Stream and changing winds may both have played a role. By October 2024, a warm eddy from the Gulf Stream had ended the event.
The monitoring model could work elsewhere: equip fishing boats with sensors, share the readings and compare them with wider ocean surveys. But it requires funding, training and cooperation. It also cannot guarantee catches or predict every shift.
Still, the effort offers a hopeful lesson. When fishers and scientists pool what they see, local knowledge can become shared evidence—and help coastal communities adapt to a changing ocean.
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