Specimen Information

Craspedacusta sowerbii
Craspedacusta sowerbii
(freshwater jellyfish)

Specimen ID1655078
Common Namefreshwater jellyfish
LocalityHunter Lake in water of approximately 22 foot depth near center of main lake
Mapping AccuracyAccurate
HUC8 NameUpper Wisconsin
HUC8 Number07070001
HUC10 NamePioneer Creek-Wisconsin River
HUC10 Number0707000103
HUC12 NameRice Creek
HUC12 Number070700010307
Collection Day25
Collection Month8
Collection Year2020
Year AccuracyActual
Potential Pathwayhitch hiker with stocked fish | hitch hiker on aquatic plants
CommentsSighting occurred by my husband and myself, mid-morning, full sunlight, approx. 80 degrees F air temp, very calm waters, as we directed our pontoon boat to the center of the lake. A pair of loons were feeding in this area; doubtful that they were feeding on the jellies. Diameter of all specimens observed was approx. 2-2.5 cm. Color was white. The hydromedusas that were visible to us ranged from 4' beneath the surface to nearly at the surface, and they seemed to be concentrated in one area. It was hard to judge their numbers, as water clarity affected our ability to see if they dove deeper, although the water was actually extremely clear for this 134 acre seepage lake. Also, the water was filled with microscopic and small algae and probably invertebrates on which the jelly fish may have been feeding. We did not observe definitive feeding. Their movement through the water was mainly horizontal, although some moved toward the water's surface. The jellyfish seldom remained at the sunny, warm surface of the water for long; it was difficult to photograph them with our cameras. Although not upload-able, we also have a video.
Record TypeNAS sighting report
Number Collected60
Craspedacusta sowerbii
Craspedacusta sowerbii
Craspedacusta sowerbii
Craspedacusta sowerbii


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Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/21/2024].

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