A man who believes he was stung by the invasive jellyfish near Island Beach State Park described the pain as "excruciating" from head to toe.
A non-native species of jellyfish whose sting was described by one possible victim as 'excruciating,' has moved from New Jersey coastal rivers into Barnegat Bay, as summer boat traffic carried algae that the tentacled, coin-sized creatures feed on, officials said Tuesday.
The state Department of Environmental Protection issued the bay advisory after earlier warnings to bathers, boaters and others that the so-called clinging jellyfish, a species native to the Pacific Ocean, were present in the Metedeconk River in Ocean County and the Shrewsbury and Manasquan rivers in Monmouth.
The DEP noted that the Metedoconk flows into the northern end of the bay, where the agency specified confirmed locations of clinging jellyfish as F Cove and along Wardells Neck, both in Brick.
Joseph J. Bilinski, a DEP research scientist, said it appeared that boating had spread the clinging jellyfish population from the rivers to the bay, just as it had spread the species from its native Pacific Ocean waters to areas around the world. This happens, as Bilinski explained, when clinging jellyfish (CJ) polyps, or clumps of cells that grow into whole individuals, become attached to boats and transported by them.
"Boating and the incidental transport of algae with CJ polyps to new...areas of the Bay from affected areas will likely be an issue since the Bay has so much boat traffic in the summer months," Bilinski said in an email on Tuesday.
The DEP has described the clinging jellyfish as being the size of a dime or a quarter, with long, stringy tentacles and markings that include a red, orange or violet cross on its middle. It has, the DEP said, "a powerful sting."
Steve Ahrens used more colorful terms to describe it. Ahrens, who lives in the Lanoka Harbor section of Lacey Township, believes he was stung by one on Sunday while standing in 3 feet of water in Tices Shoal, on the bay side of Island Beach State Park.
"I got stung on my buttocks and knew right away," said Ahrens, 58. "That evening I was in excruciating pain from head to toe, like I was being stabbed with a thousand ice picks at once. I went to Community Medical Center in Toms River at approximately 2 a.m. because the pain was unbearable."
Ahrens said he saw his own doctor later on Monday and was prescribed steroids and naproxin. By midday on Tuesday he was feeling much better, though he added, "I'm stiil feeling pin-pricks." He also carries viniger in his boat, after having heard that it sooths the sting.
Wearing a rash guard and spreading petroleum jelly on exposed skin are said to reduce the chances of being stung.
The area where Ahrens was stung is farther south than areas where the DEP has confirmed clinging jellyfish to be. And a DEP spokesman, Larry Hanja, said it was possible that Ahrens had suffered "an extreme reaction" to being stung by a larger, generally less harmful species of jellyfish native to Barnegat Bay known as a Bay nettle.
But Dr. Paul Bologna, who is director of the Marine Biology and Coastal Scienses Department of Biology at Montclair State University and has worked with the DEP to track the clinging jellyfish, said he would visit the shoal where Ahrens was stung to look for the invasive species.
That region was not a high priority to sample because it was so far south," Bologna said in an email Tuesday.
Ahrens said he had noticed on Sunday that the shoal was dense with sea grass, consistent with the DEP's warning that clinging jellyfish were drawn to marine vegetation. He also noted that the shoal is a popular spot for boaters and jet skiers, and he was concerned that many more people would be stung.
"Boating/shipping activity appears to be the strongest vector for new CJ establishment worldwide," Bilinski added. "CJ's won't be everywhere in the Bay -- they prefer the shallow and lower velocity areas -- but the potential to have them in many areas is likely since there is a significant amount of healthy sea grass beds."
Bilinski said there was little the state could do to curb the clinging jellyfish population. But he said the species does have a natural enemy that, while ordinarily viewed as pesky to bathers, could be an ally in this particular fight.
"There really are no methods to control them," Bilinski said. "However, we do know -- and this is the good news -- that they are prey for Bay nettles."
Steve Strunsky may be reached at sstrunsky@njadvancemedia.com. Follow him on Twitter @SteveStrunsky. Find NJ.com on Facebook