Saving Seafood

Shark Depredation Tripled in 20 Years of Longline Survey

October 20, 2026 — Depredation, the removal of or damage to hooked fish or gear by sharks or other marine predators, is a growing concern among fishing communities. Depredation results in increased mortality for managed fish stocks, economic loss, and degraded fishing experiences.

NOAA Fisheries biologists Dr. William “Trey” Driggers and Dr. Walter Ingram recently analyzed data from the Southeast Fisheries Science Center’s Bottom Longline Survey. Their goal: to determine trends in depredation rates over the past two decades. This is one of the first fishery-independent analyses of shark depredation—most research has been conducted in the fishery. The data confirm what anglers are seeing on the water: increasing trends in depredation by species like sandbar, blacktip, bull, and tiger sharks. 

History of the Bottom Longline Survey

The annual Bottom Longline Survey, which started in 1995, samples U.S. waters of the Atlantic Ocean, including the Gulf of America, from Brownsville, Texas, to Cape Hatteras, North Carolina. Scientists use these data to monitor trends in abundance of federally managed sharks and other fish species like red snapper. It provides fishery-independent indices of abundance for numerous federal stock assessments in the Southeast region. When the survey protocol was standardized in 2001, Dr. Driggers recognized the importance of collecting data on depredation events. He added it as a standard data collection metric for the survey.

Since 2005, the survey has collected data on:

  • Whether depredation occurred
  • Predator species preying on the hooked catch, when possible
  • Species of the depredated catch
  • Variables like location, depth, temperature, and salinity

This has resulted in a standardized record of depredation events for all survey longline sets for more than two decades.

Read the full article at NOAA Fisheries

Baby sharks grow up in New Jersey’s back bays. Climate change could threaten the nurseries

July 31, 2026 — New Jersey’s back bays, those lush wetlands that sit between the barrier island beach towns and the mainland, are home to unknown numbers of baby sharks that feast on the American eel, crabs and small fish that thrive in the coastal salt marshes. Giving birth to litters in those food-rich shallow waters like Little Egg Harbor is just about all the maternal care given to the shark pups by their mothers, who swim back out to the Atlantic Ocean soon afterwards.

The tiger shark, the sandbar shark and the smooth dogfish return each summer to the Jersey coast to give birth between June and July, utilizing the safety of shallow waters that are free from predators that would devour their newborns. Although the smooth dogfish can grow to 3 feet long, the babies are no larger than 12 inches at birth and litters range in size from four to 20 pups. The dogfish are benthic feeders, meaning they forage along the bottom of the marsh.

“We all have our favorite shore towns,” said Adrianna Zito-Livingston, an ecologist who works as the climate adaptation project manager for the New Jersey Nature Conservancy. “We come back year after year. The sharks are doing the same thing.”

The Nature Conservancy is working with Monmouth University to research the health of the salt marshes that have become eroded due to the impacts of climate change. As part of that work, researchers like Zito-Livingston are tagging the sharks with acoustic trackers that are then monitored by listening stations placed along the Jersey coast. She said the sharks provide a good indication of the health of the salt marshes.

“In a lot of ways, sharks are a canary in the coal mine,” she said. “They’re top predators and healthy sharks with a good distribution are indicative of healthy, diverse ecosystems.”

Read the full article at WHYY