Bay Journal

Atlantic sturgeon jumps out of nowhere into boat on MD creek

Biologists trying to figure where fish – believed to be extirpated in state – came from.

  • By Karl Blankenship on November 17, 2013
Bill Harris holds up an Atlantic sturgeon that leapt into his boat while he and a friend were fishing on Marshyhope Creek, a tributary to the Nanticoke. Although it has been going on for centuries, no one knows what causes large sturgeon to leap out of the water.  (Randy Rowland)

Two years ago, Bill Harris and his daughter were fishing on Marshyhope Creek on the Eastern Shore when suddenly, across the river, a large sturgeon jumped out of the water.

“‘That is a once in a lifetime experience!’” Harris exclaimed to his daughter, Susan. “We’ll never see another sturgeon.”

He was wrong. During fishing trips last year with his friend, Randy Rowland, the two retired U.S. Department of Agriculture scientists saw sturgeon after sturgeon. They counted nearly 50 jumping sturgeon during their weekly fall fish trips on the creek, a tributary to the Nanticoke River.

This year, they got an even closer look. On Sept. 20, Harris and Rowland were carp fishing when they saw a number of sturgeon jumping nearby. They edged nearer.

Suddenly, a 5.5-foot sturgeon leapt out of the river and into their 16-foot boat, landing between Harris, who was sitting in the back seat, and the motor. The big fish knocked a rod holder off the boat, sent a fishing rod into the water and brushed against Harris’ thigh. “It went ballistic,” recalled Harris, who leapt from his seat. “I was hoping he wouldn’t beat the bottom out of the boat.”

The fish calmed down after less than a minute, and the two men were able to return it to the water. But they also took pictures — photographic evidence of what a number of other people have reported in recent years: large, jumping sturgeon in the Marshyhope and Nanticoke.

State and federal biologists, intrigued by the reports, have made several excursions onto the river to find sturgeon but with no success thus far. “The only things we’re catching are sticks,” said Chuck Stence, a fisheries biologist with the Maryland Department of Natural Resources. “I don’t doubt him that he is seeing them, especially when you have one jump in your boat.”

No one knows why large sturgeon leap from the water, but it’s been going on for centuries. During the Revolutionary War, a soldier was killed while rowing across the Potomac River when a sturgeon jumped out of the water and landed on him.

The bigger mystery is why there have been so many reports coming from the Nanticoke and Marshyhope in the last several years. Although large sturgeon are occasionally seen in Maryland waters, breeding populations are considered to be extirpated in the state.

One possibility: The Nanticoke was the scene of an experimental release in 1996 of more than 3,000 hatchery-reared sturgeon. Sturgeon are an anadromous fish that spend most of their lives off the Atlantic coast but return to their native river to spawn. Sturgeon are long-lived, slow-maturing fish that don’t begin to reproduce until they are about 15 years old.

So the timing is about right for some of those fish to return. Dave Secor, a fisheries scientist with the University of Maryland Center for Environmental Science who participated in the original Nanticoke release, said that the fish being reported — mostly in the 5–6 foot range — are “in the ballpark” of being the right size for 17-year-old sturgeon.

Yet he and others are uncertain the fish came from the 1996 release. Those sturgeon were the offspring of adult fish from the Hudson River that were produced at a U.S. Fish and Wildlife Service hatchery in Pennsylvania.

Not only were the fish not from anywhere near the Nanticoke, they were a year old when they went into the river. Biologists don’t know when young sturgeon “imprint” on their native river so they can find their way back as adults, but they think it’s before a year. Hatchery-reared shad imprint on a river within 45 days of hatching, said Brian Richardson, of the Maryland Department of Natural Resources.

“It does correspond with the stocking in 1996, as far as these fish coming back,” Richardson said. “But I would be very surprised if a sturgeon stocked at a year of age imprinted to the river.”

Secor said there are other possibilities. The large number of adult sturgeon being caught on the James River the last few years suggest that river might have had several strong years of reproduction about 15 years ago. Some of those returning fish might be finding their way into the Nanticoke.

“In the grand scheme of things, the Nanticoke isn’t that far from the James,” Stence noted.

It’s also possible, Secor said, that they actually are Nanticoke fish. The last egg-laden female found on breeding grounds in Maryland was in the Nanticoke River in 1972.

Although no breeding population is known, it’s possible a small number of fish survived unprotected, and successfully reproduced about 15 years ago, and their progeny are now returning to the river. After all, in the mid-1990s, most biologists didn’t think there were any sturgeon in the James River, either. “There could have been some type of cryptic reproduction we didn’t know about,” Secor said. “We can’t rule that out because obviously we didn’t think anything was going on in the James.”

The origin of the fish won’t likely be resolved until biologists successfully capture a fish and get a tissue sample that can be analyzed in the lab to identify the source of the fish.

In the meantime, Richardson said, Atlantic sturgeon will continue to be considered extirpated from Maryland until biologists find evidence of actual reproduction in the form of little sturgeon.

“We never really looked for little sturgeon, either,” he added. “So it’s possible there has been some spawning going on that we don’t know about.”

Some of those answers could come next year, when biologists hope to return to the river with new nets, new equipment such as side-scan sonar, and new knowledge from people like Harris and researchers in Virginia about how to better find and net large sturgeon.

If they catch a fish, they’ll not only get a tissue sample for DNA analysis, but when they make an incision to place a tracking tag, they will be able to peer inside the fish to see if it is “ripe” — ready to spawn.

“I’m looking forward to this coming year,” Stence said. “If we do find that we have a spawning population here, that would be great.”

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About Karl Blankenship

Karl Blankenship is editor of the Bay Journal and Executive Director of Chesapeake Media Service. He has served as editor of the Bay Journal since its inception in 1991. .(JavaScript must be enabled to view this email address).

Read more articles by Karl Blankenship

Comments

pat mckinney on November 18, 2013:

We have sturgeon in our Suwannee River and the month of May seems to be when most of the leaps occur. Just about every year there are people boating on the river who are injured by jumping sturgeon


Susan Rodriquez on November 20, 2013:

Very educational!


Gene Kelly on November 25, 2013:

great, great article. If you have sturgeon in your waters, you must be doing something right.


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