August 11, 2026 — The sun was out and the sea conditions were ideal. Fish were being hauled onboard at a consistent rate. I was sampling spiny dogfish on the back deck of the F/V Tenacious II when the captain stopped the hauler and said, “Hey, we caught something different.” I looked up at the hauling station and saw the captain unhooking a chain dogfish, a new species to the Gulf of Maine Bottom Longline Survey . The survey focuses on the rocky bottom habitat in the Gulf of Maine. Every year in the spring and the fall, we partner with two commercial fishing vessels to haul up 45,000 individual hooks from the rocky bottom of the Gulf of Maine from 45 randomly selected locations. We conduct the survey in parallel with the Northeast Bottom Trawl Survey , which samples in the Gulf of Maine during the same time each spring and fall.
Typically we see spiny dogfish, white hake, and haddock along with a variety of other commercially important species. Over the more than 10-year history of this survey, the species caught are typically similar each season. But, occasionally we encounter new species. This spring, during the first trip of the 2026 season, we were excited to encounter a new species.
New species added to our list: the Chain Dogfish
We were fishing in the southeastern corner of the Gulf of Maine on our first leg of the 2026 spring season, when we added the chain dogfish to our list of encountered species. This was the first chain dogfish ever seen in 12 years of the survey. Chain dogfish have a very charismatic pattern on their body, with intricate black lines that stand out sharply against the gray body resembling a tiger.
- Species: Chain Dogfish (S cyliorhinus retifer )
- Habitat: Demersal (near the sea floor)
- Range: Western Atlantic (Massachusetts to Nicaragua)
- Most abundant off the coast of Virginia and North Carolina in depths between 120 and 2,500 feet.
- Size: 4 to 24 inches
Another Uncommon Species to the Gulf of Maine: Golden Tilefish
This survey encountered golden tilefish as well, which are also not typically found in the Gulf of Maine. This season, we were fortunate enough to encounter three individuals during the first leg of the spring survey. Like the chain dogfish, our survey typically encounters this species in the southeastern Gulf of Maine. Golden tilefish have a very distinctive coloration and pattern. Golden tilefish are vibrant deep-sea fish sometimes called “clowns of the sea”. They have bright iridescent blue-green backs, scattered spots of yellow and gold, and crisp white bellies. Their heads are rosy-pink and they feature a large, fleshy crest or flap on top. In addition to the vivid coloration, Golden tilefish are considered a delicacy by seafood lovers.
- Species: Golden tilefish ( Lopholatilus chamaeleonticeps )
- Habitat: Demersel along the ocean floor along the outer continental shelf and upper slopes
- Range: Throughout the western Atlantic Ocean from Nova Scotia, Canada, south to northern South America, including the Caribbean and the Gulf of Mexico. In U.S. waters, they are most abundant from Nantucket Island, Massachusetts, down to Cape May, New Jersey, at depths between 250 and 1,500 feet.
- Size: 10 to 45 inches
Days at sea can be long and the unfavorable weather conditions can make the work difficult, but getting the opportunity to work on a boat in the Gulf of Maine is one of my favorite aspects of this job. At the end of the last haul of this particular trip, after being on deck all day, the sun was beginning to set. The seas were calm and the sky was clear. The sunset over the horizon, turning the sea surface orange while I was finishing data collection and cleaning up the gear was a scene I will never forget.
Being an avid recreational fisherman myself, the ability to collect data that helps contribute information to improve stock assessments and understand fish stocks is very meaningful to me. I also enjoy seeing new and unusual species come aboard during the survey. As ocean conditions change, seeing new species reinforces how essential long-term data collection is to tracking and adapting to the changing Gulf of Maine.