This growing in our dam.Slowly taking it over .
In spring it must flower and the water turns blood red .
My wife was freaking out thinking something had got butchered there.
Submerged macrophyte growing in 0.5m deep water, sandy bottom at lake edge. Growing in a meadow with Chara sp. Possibly this is N. hyalina. https://niwa.co.nz/our-science/aquatic-biodiversity-and-biosecurity/our-services/aquaticplants/outreach/species/submerged
Submerged in water in drainage ditch.
Common 'by catch' in seine net. Poor images sorry.