Saving Seafood

A U.S.-Funded Study Of Whales’ Hearing Is Going Ahead Despite Concerns For The Whales

June 9, 2021 — An international team of scientists is preparing to trap a dozen baleen whales off the coast of Norway and conduct hearing tests on them to gauge their sensitivity to human-made sounds such as sonar.

Researchers have tested the auditory faculties of smaller animals in captivity, but this would be the first time scientists have ever captured live whales in the wild to assess their hearing.

“This has been a long-standing issue, this lack of information on how sensitive the hearing of these large whales is,” said the project’s principal investigator Dorian Houser, of the National Marine Mammal Foundation.

“We’re trying to get the first measurements to empirically show what they hear and how sensitive to sound they are,” he said.

The goal of the project, which was initiated and is partly funded by the U.S. government, is to use what they learn to regulate human-generated noise in the waters where these whales swim. It could have implications for the military as well energy companies.

Read the full story at NPR

Baleen Whales Have Changed Their Distribution in the Western North Atlantic

July 17, 2020 — The following was released by NOAA Fisheries:

Researchers have been using passive acoustic recordings of whale calls to track their movements. They have found that four of the six baleen whale species found in the western North Atlantic Ocean — humpback, sei, fin and blue whales — have changed their distribution patterns in the past decade. The recordings were made over 10 years by devices moored to the seafloor at nearly 300 locations from the Caribbean Sea to western Greenland.

“All four whale species were present in waters from the southeast U.S. to Greenland, with humpbacks also present in the Caribbean Sea,” said Genevieve Davis, a senior acoustician at the Northeast Fisheries Science Center in Woods Hole, Massachusetts and lead author of the study. “These four species were detected throughout all the regions in the winter, suggesting that baleen whales are widely distributed during these months. Humpback, sei, fin, and blue whales also showed significant changes in where they were detected between the two time periods considered in this study: before and after 2010.”

A large group of federal, state and academic researchers from the United States and Canada conducted the study, published in Global Change Biology. It is the first to show the occurrence of these four species across the western North Atlantic Ocean over long time spans and at a large spatial scale. The study also demonstrates how whale distributions have changed over time, and in particular since 2010.

Read the full release here

Feds declare Gulf whale species endangered

April 15, 2019 — Federal officials today declared a tiny group of Bryde’s whales in the Gulf of Mexico endangered, facing threats including oil and gas exploration and development.

“They’re the only year-round baleen whales that make their home in Gulf of Mexico, and (they) have a unique and very important role in the ecosystem,” said Laura Engleby, a marine mammal biologist with the National Oceanic and Atmospheric Administration fisheries’ service.

A Republican congressman from Florida and a marine mammal scientist in Massachusetts applauded the decision to protect the whales. There probably are about 33 of them in a deepwater area called the DeSoto Canyon, Engleby said. If there are any in the southern Gulf, she said, the total including the known population is probably less than 100.

Read the full story from the Associated Press at The Daily Comet