Free-Floating Aquatic Weed Identification

Definition: Free-Floating Aquatic Weeds have roots that are not attached to substrate and float on the water's surface.

There are also 3 other types of Aquatic Weeds:


Duckweed

Species: Duckweeds      Family: Lemnaceae

     


Distribution

NSW, QLD, VIC, SA, NT, ACT, WA, TAS

Description

This tiny floating aquatic plant with distinctive fern type leafed appearance grows in size from 1cm to 3cm in diameter, with roots trailing down on the bottom side of the plant up to 4cm long.

Life Cycle

Perennial

Origin

Native

Control Methods


Ferny Azolla

Species: Azolla Filiculoides/Pinnata    Family: Azollaceae

     
 

Distribution

NSW, QLD, VIC, SA, NT, ACT, WA, TAS

Description

From 1-2.5cm in diameter. Older plants in full sunlight are reddish, whereas plants in shade are greenish.

Life Cycle

Perennial

Origin

Native

Control Methods


Liverwort

Species: Ricciocarpus Natans    Family: Ricciaceae

     
 

Distribution

QLD, NSW, VIC, TAS

Description

Green with blackish outer edges. Appearance of leaf growing side-by-side or divided into two. Underside leaf bears purplish scales. Often found floating with Duckweeds on still water.

Life Cycle

Perennial/Annual

Origin

Native

Control Methods


Salvinia

Species: Salvinia Molesta    Family: Salviniaceae

     
 

Distribution

TAS, VIC, ACT, NSW, QLD, NT, SA, WA,

Description

Has floating leaves covered with tiny hairs which makes the weed waterproof. Has been known to double it's size extremely quickly in as little as 5-10 days. Prefers to grow in slow moving water bodies, Can spread through water fowl. Is a threat to biodiversity, including fish, insects or any plants underneath it's mat.

Life Cycle

Perennial

Origin

Introduced

Control Methods


Water Lettuce

Species: Pistia Stratiotes    Family: Araceae

     
 

Distribution

NSW, QLD, VIC, SA, NT, ACT, WA, TAS

Description

Also known as water cabbage. It can completely cover water bodies, reducing oxygen, killing fish & attracting mosquito's. Can be 10cm tall and 30 cm wide. Reproduces rapidly by offshoots. Occurs in slow moving waterways in tropical and subtropical warmer temperate regions.

Life Cycle

Perennial

Origin

Introduced

Control Methods


Water Soldier

 Species: Stratiotes Aloides    Family: Hydrocharitaceae

     
 

Distribution

None at present

Description

  • Physical removal via skimmers
  • ½ HP Aeration Fountain
  • Harvesting

Life Cycle

Perennial

Origin

Introduced

Control Methods




 

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Emergent Roots are anchored in the substrate with stems, leaves or flowers projecting above the water’s surface.
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Floating Attached Roots are attached to substrate. Stems, leaves or flowers may/may not be above water’s surface.
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Algae No distinguishable roots, stems or leaves.
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Free Floating Roots are not attached to substrate and float on the water’s surface.
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Submerged Growing below the water’s surface whether attached to substrate or not.
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