Translucent elongated Ciona can be seen on this settling plate retrieved by Smithsonian Lab. These seem not to be present or at least to dominate in 2017, as they did in 2016. A concerted search will be made this week for them.

Water quality at Lake Chalet across lake.

Water Temperature 21 degC
Salinity 31.1 ppt
Dissolved oxygen 5.2 ppm
Secchi 1.3 meters, depth2.6 meters