June 11, 2025

Phytoplankton samples were collected on June 11, 2025 at Bullock’s Reach and analyzed in the laboratory shortly after collection.

The water temperature was 18.0 °C, the salinity was 21.28 psu, and the chlorophyll a was 4.24 ug/L.

The qualitative tow net sample had a moderate filtration time. The filtrate had a medium brown/green coloration.

The analysis of the quantitative whole water sample revealed a total of 5,517,000 cells/L. The microflagellates were found at 112,000 cells/L. The most predominant phytoplankton genera were Guinardia spp. at 1,652,000 cells/L, Chaetoceros spp. at 1,448,000 cells/L, and Leptocylindrus spp. at 1,044,000 cells/L.

200x phase contrast micrograph of phytoplankton
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