River OtterOnce trapped to near-extinction for their glossy fur, river otters have made a comeback. Populations in Pennsylvania have been boosted by the introduction of otters from Maryland's Eastern Shore.

Aquatic Ambassadors: River Otters are Poster Pups for Conservation

By Julie Dunlap
Published in the Spring 2008 issue of Save The Bay magazine

With the help of remote video cameras along two Pennsylvania rivers, researcher Sadie Stevens has spent hours filming the droll capers of wild river otters. Her sleek subjects inhabit streams throughout Chesapeake country, but are so elusive that few have the opportunity to view them as she does.

Stevens' window into otters' secret lives reveals their well-known penchant for wrestling, rolling, sniffing, and sliding in mud and snow. She's even grown fond of their "latrine dance," a foot-pumping ritual performed while depositing scat. "Otters are great to watch," she says of the footage.

Once, the Bay region teemed with otters. Two centuries ago, naturalist John James Audubon could count 46 of the "singular quadrupeds" on a single river in two hours. But unregulated trapping for their glossy brown fur swiftly exhausted otter populations across the continent.

Chesapeake marshes remained a refuge, but the weasel relatives, which average about two pups per litter, could not sustain the heavy harvest. Trapping pressures were compounded by the growing loss of wetland and riparian habitats, as well as water pollution from mining and industrial development.

Spotting River Otters

DESCRIPTION: River otters have long, streamlined bodies and short, powerful legs with webbed feet.

SIZE: The average otter weighs 18 pounds and is 40 inches long.

WHERE AND WHEN TO LOOK: Keep an eye out along rivers and marshes throughout the Chesapeake's tidewater areas around sunrise and sunset. Because otters are such shy animals, you are more likely to discover evidence of their presence: tracks, slides, or scat.

TRACKS: River otters have webbed feet with five toes. Tracks are about the size of the bottom of a soda can.

SLIDES: Usually found along muddy banks, otter slides are about six inches wide and two-to-three feet long.

SCAT: You will recognize a latrine site by remnants of the otter's fishy diet: scales and bones.

By the 1980s, only remnant populations survived. In Pennsylvania, a small community of 350 persisted in the Pocono Mountains, isolated from their Bay-area brethren by cities and dams along the Susquehanna River. But graduate student Tom Serfass, encouraged by water quality improvements in the area, thought that reintroduction was possible, and pioneered the first restoration efforts. Now a professor at Frostburg State University, Dr. Serfass recalls feeling nervous when he freed his first four otters from their cages into Kettle Creek, a tributary of the west branch of the Susquehanna, in 1982: "We didn't know if they were going to survive."

Radio telemetry data from the released (and thriving) otters restored his confidence. The program grew quickly, ultimately releasing over 150 animals, including 40 captured from Maryland's Eastern Shore.

Some fishermen originally opposed reintroduction, believing that otters would deplete trout populations. But studies revealed that Pennsylvania's river otters primarily consume crayfish, minnows, and other non-game species. The scientific evidence convinced fishermen to join river activists, busloads of school children, and television crews at future releases. Their diverse support didn't surprise Serfass, who calls otters "ambassadors for aquatic conservation."

Actual counts of the notoriously shy creatures are hard to come by, but every Pennsylvania watershed now hosts river otters, and populations are believed stable or growing in other Bay states.

Serfass urges continued vigilance throughout the Bay watershed. "It's great to point to successes," he says, such as well-regulated trapping, "but we still have abandoned mine drainage...We're not making any more of these [otter] habitats."

Otters play a vital role in their own protection. Because of their sensitivity to human activity, says Frank Felbaum, former executive director of Pennsylvania's Wild Resource Conservation Fund, "they're an indicator species to the nth degree. They'll be out of an area before people know what's going on."

The successful reintroduction has cast the curious, playful creatures in a new role as conservation icons. Otter releases came to symbolize river cleanup, says Serfass, because "Pennsylvania realized otters' appeal promotes conservation—not just of otters, but conservation of other species and associated habitats." He advocates more public education about otters in aquatic environments, especially for schoolchildren. The reason is simple, he states. "The river otter is a very attractive face that can be put forth as a reason to conserve the bigger picture."

Questions that require an answer are marked with  *
* Please take a moment to provide the following information so that we may keep you updated on issues and events near you.
 E-Mail Address
 First Name
 Last Name
 Zip Code
* Timestamp

You will begin to receive Bay updates from CBF soon.

In the meantime, join the Bay-friendly conversation on Facebook and Twitter!


1-888-SAVEBAY / 1-888-728-3229

BBB Accredited Charity
GuideStar Exchange Gold Participant Seal

Bids & ProposalsPrivacy Policy

© 2017 Chesapeake Bay Foundation.
All Rights Reserved.

The Chesapeake Bay Foundation is a nonprofit,
tax-exempt charitable organization under
Section 501(c)(3) of the Internal Revenue Code.
Donations are tax-deductible as allowed by law.