Invasive jellyfish with powerful sting found in another N.J. river

A tiny invasive jellyfish that packs a powerful sting has been found in the second Jersey Shore river since May.

Dr. Paul Bologna, a Montclair State University professor and jellyfish expert, says the dime-sized clinging jellyfish was found in northern Ocean County’s Metedeconk River, which is a Barnegat Bay tributary.

Last month, the same species was found in the Shrewsbury River off Monmouth Beach in Monmouth County.

Clinging jellyfish, native to the Pacific Ocean region, were first found in New Jersey in 2016 when a fisherman collected one near the Point Pleasant Canal in Ocean County. Dozens were then spotted in the Shrewsbury River. Officials don’t know how they arrived in New Jersey.

Oceanus Magazine describes the species as resembling “a piece of art glass or a flash bling brooch you would never want to wear” with “hula-hoop skirts of 60 to 90 glass-like tentacles that uncoil sharp threads and emit painful neurotoxin.”

A state news release advises that clinging jellyfish are not known to inhabit ocean beaches or other sandy areas.

Rather, they tend to attach themselves to “submerged aquatic vegetation and algae in back bays and estuaries — areas not heavily used for swimming,” according to the release.

Officials say anyone stung by the jellyfish should immediately treat the impacted area:

• Apply white vinegar to the affected area to immobilize any remaining stinging cells.
• Rinse the area with salt water and remove any remaining tentacle materials using gloves or a thick towel.
• A hot compress or cold pack can then be applied to alleviate pain.
• If symptoms persist or pain increases instead of subsiding, seek prompt medical attention.

Anyone who spots these jellyfish or anything unusual can post to the New Jersey Jellyspotters Facebook group.