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The Work Must Go On: Back-Up Plans Keep Longline Survey Improvements Moving

August 21, 2020

Scientists will install and test a new data collection system on two Massachusetts fishing vessels for the twice-yearly Gulf of Maine Bottom Longline survey. It’s a story of perseverance and flexibility in the face of difficult challenges.

Retrieving sampling equipment.

For the past 6 years, the 50-foot F/V Mary Elizabeth out of Scituate, Massachusetts and the 40-foot F/V Tenacious II out of  East Dennis have set out on a 3-week, 45-station longline research survey. They will target areas in the Gulf of Maine where the fish like to hide and the ocean bottom is rougher, making it hard to sample with trawl gear. Scientists from the Northeast Fisheries Science Center are aboard to work up the catch to scientific specifications.

Things have been going well. Every year, the methods and technology have improved. This year a new generation of technology was ready to go—then came COVID-19. What’s a researcher to do when field sampling grinds to a halt? Go to Plan B.

Back Up Plans for the Back Up Plans

“When it was clear we’d not be able to do our usual spring survey, we looked for ways to make the best of it,” said Anna Mercer, chief of the Center’s Cooperative Research Branch. Mercer and her colleagues looked to a new window of opportunity—late August. What was doable? What was most valuable? Could it be done safely?

Longloine survey gear on the deck of a boat

Bottom longline survey gear ready for deployment. Photo NOAA Fisheries

They could address an important research question: what happens around the longlines while they are soaking? How good is the gear at catching the fish around it? How different are catches with fewer hooks or shorter soak times? How much of the bait is picked off by species the survey is not targeting?

Things were looking positive at first. However, travel restrictions, supply chain back-ups, time needed for sheltering in place ahead of the trips, and variability in local COVID positivity rates defeated this plan.

“Fortunately, there is a Plan C,” said Mercer. “Wherever there are instruments collecting data, there must be software, right? Yes. And there’s a new generation of software and hardware ready to go that will further automate data collection and processing during the survey. Plan C is to get it installed and tested.” 

Installation can be safely done dockside with a small number of people and limited physical contact. On a few day trips, researchers and crew can test the new set-up on each vessel, identify and address bugs, and document new protocols.

“It’s not how any of us thought this summer would go, but I am pleased we have some time to get this next generation of technology onto the boats and ready to use,” said Mercer. “With this testing done, we will be more ready than ever when we get back to sea.”

Last updated by Northeast Fisheries Science Center on September 10, 2021