Could stressed out sharks save more fish? (w/ Video)

Oct 02, 2009
Could stressed out sharks save more fish?
Austin Gallagher free diving with whale sharks in Mexico.

(PhysOrg.com) -- Marine biology graduate student Austin Gallagher has studied the dwindling shark population around the world—from the waters of the South Pacific to those off Southern California.

Now, as a research assistant at the New England Aquarium, the 23-year-old is focused on tracking the stress levels of . He’s working on a portable way to measure stress in the giant fish when they’re accidentally captured and thrown back during expeditions. It turns out that the stress alone causes some of these species—including the hammerhead shark—to die.

The goal is to make it easier to collect information that illuminates for fishermen and conservationists the connection between fishing practices and the overall health and sustainability of fish populations.

“This is just a small piece of the larger puzzle about the of marine life,” cautions Gallagher about the big-picture applications of his work. “But if these portable analyzers can help us better gauge the physiology of threatened sharks, then we may be able to make more informed conservation decisions.”

This video is not supported by your browser at this time.


Video: A trailer of Gallagher’s underwater documentary on marine protected areas inside a Marine Reserve on California’s Catalina Island.

Over the past 50 years, global shark catch increased nearly three-fold, peaking at roughly 900,000 in 2003. And as of last year, nearly 17 percent of shark and ray species landed on the Nature’s Red List of Threatened Species compiled by the Switzerland-based International Union of Conservation, the world’s largest environmental network. As shark species continue to show up on endangered lists, research such as Gallagher’s could become increasingly important in protecting these commercially exploited marine animals.

Gallagher is conducting his research as part of the Three Seas graduate program at Northeastern, a 15-month master’s program during which students study in three different aquatic environments—in Massachusetts, the French Polynesia, and off the coast of Southern California.

Working with Aquarium research scientist Dr. John Mandelman, Gallagher is testing the reliability of a small blood analyzer that could be used right on the boat, rather than previous methods that were too cumbersome to accompany fishermen at sea. To assess the tool’s accuracy, Gallagher draws blood from a caudal vein in the shark’s tail immediately after the is taken from the water, tests the sample using a remote blood analyzer, and compares the value against conventional analyses.

The blood-sampling process resembles the one a physician uses drawing human blood. “What I do with sharks is actually quite similar,” says Gallagher, “but my patients have sharper teeth and are more difficult to calm down.”

Gallagher credits Northeastern’s Three Seas program for giving him the jumpstart he’ll need for a career in shark research. “The program is teaching me how to do sound science, collect my own data, and interact with the scientific community,” he says.

He hopes eventually to combine his passion for science with that of filmmaking in order to more effectively communicate conservation messages. Right now, he’s awaiting the green light on a project documenting sharks and humans interacting.

Provided by Northeastern University (news : web)

Explore further: Scientists discover tropical tree microbiome in Panama

add to favorites email to friend print save as pdf

Related Stories

Foldable phone opens into large OLED screen

Nov 24, 2008

(PhysOrg.com) -- A new cell phone developed by Samsung opens like a book to reveal a larger OLED screen, essentially turning the phone into a portable media player. Samsung recently demonstrated the prototype ...

Dell Talking About 80-Core Chip Processor

Nov 20, 2008

(PhysOrg.com) -- This week Michael Dell (CEO of Dell) gave a slide presentation that included Intel´s recently developed 80-core processor. This isn't the first time that the 80-core chip was mentioned in ...

Recommended for you

Global wild tiger population to be counted by 2016

7 hours ago

Thirteen countries with wild tiger populations agreed Tuesday to take part in a global count to establish how many of the critically endangered animals are left and improve policies to protect them.

Scientists discover tropical tree microbiome in Panama

22 hours ago

Human skin and gut microbes influence processes from digestion to disease resistance. Despite the fact that tropical forests are the most biodiverse terrestrial ecosystems on the planet, more is known about ...

How are hybridized species affecting wildlife?

Sep 15, 2014

Researchers who transplanted combinations of wild, domesticated, and domesticated-wild hybridized populations of a fish species to new environments found that within 5 to 11 generations, selection could remove ...

User comments : 0