Invasive SpeciesHydrilla

Hydrilla verticillata
FOUND by iSpyaSign
ID Confirmed
Quality checked by vitalsleuth
Peer reviewed by DataTrooper
Field Notes
For years we've been on the lookout for Maine's 10 most unwanted aquatic nuisance species, and alas, it appears we have a sighting of the most aggressive of them all - hydrilla. Thanks to the efforts of volunteer lake monitors, this particular area of infestation was detected early, and is believed to be contained within a small lagoon area. This area has been cordoned off by DEP personnel to prevent spread, while a decision is being made on a longer term course of action. Sampling of a nearby similar lagoon provides initial confirmation that this sighting may be the only area of infestation, but more sampling of the entire lake will be needed, now and again in the next year(s). See second observation for comparison habitat characteristics and photos for the lagoon that appears hydrilla-free, located less than 300 yards away from this site.
Supporting Evidence
Photo of my evidence.
The lake's lagoon looked like it had a carpet of weeds just below the surface of the water.
Photo of my evidence.
The plants that blanket the bottom of the lake have 5 leaves per segment. They grow around a fleshy stem.
The leaves were a bright green color and created a tangled mass of vegetation. Some of the stem segments had little white filamentous roots growing off of them. It seemed these were ready to break off and disperse a "ready to root" new shoot.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Hydrilla verticillata
Common name:
Count of individuals: 
3/4 - Completely covered
Vegetative structures (plants)
How big is it?: 
Greater than 10 cm
Is it male or female?: 
Can't tell
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 44.163060 °
W -69.489170 °
Observation Site Information
A photo of our study site.
Freshwater - In a pond or lake
Trip Information
Damariscotta Lake
Trip date: 
Thu, 2009-10-01 22:39
Town or city: 
Type of investigation: 
Species and Habitat Survey
Dead River
MIDAS Code: 
Habitat Observations
Species diversity: 
6 different species
Evidence of vectors: 
Water temperature: 
Dissolved oxygen: 


good pictures they are clear and support the good details and field notes you made

nice photos and notes!!!

You had great field notes, and great details. But I wished that you had a couple more close up pictures of the species.

They are so many of this species in the wetland you studied. I enjoyed looking at your few pictures, but I wished there were more. Some advise would be to maybe draw a sketch to help us understand your species thoroughly.

Hi iSpyaSign,
You did a very good job on you topic. The pictures really showed what the habitat looked like. Your information was put together very well to. Good Job!

The BumbleBee Team