Distribution of Chrysaora quinquecirrha in the York River

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Abstract
Distribution, quantitative abundance, and period of maximum set of the polyp stage of the sea nettleChrysaora quinquecirrha DeSor were investigated in the York River, Virginia, from September 1966 to November 1967. The distribution and abundance of the medusoid stage were also determined. Effects of varying salinity and temperature on the polyp were investigated in the laboratory. The polyp stage occurred on oysters and shells dredged in a 12-mile segment of the river. Medusae appeared in tributary creeks in June, 15 to 30 days carlier than in the river. In the river, medusae were observed between 12 June and 2 October; peak abundance was reached during the week of 17–21 July. Polyps had a minimum salinity tolerance of 5–10‰; the upper limit exceeded 40‰. A gradual temperature rise (I C/day) between 1–29 C caused no mortality of polyps. Strobilation occurred at 20–22 C. One new ephyrae predator was found: a barnacle,Balanus eburneus.

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