Although there are many non-native invasive plant and animal species that, under the right conditions, can become a threat to the environment, there are certain aquatic species that are of particular concern to the aquarium and ornamental water garden trade.

The most common aquatic invasive plants and animals that aquarium hobbyists, backyard pond owners and water gardeners should be familiar with include:

• Common reed (Phragmites australis)
  Invasive water garden plant
  Global Invasive Species Database
  Nature-Action Québec
  
  
• Curly leaf pondweed (Potamogeton crispus)
  Invasive water garden plant
  Global Invasive Species Database
  
  
• Eurasian milfoil (Myriophyllum spicatum)
  Invasive aquatic plant
  Global Invasive Species Database
  Ontario's Invading Species Awareness Program
  Nature-Action Québec
  
  
• European Frogbit (Hydrocharis morsus-ranae)
  Invasive water garden plant
  Global Invasive Species Database
  Ontario's Invading Species Awareness Program
  Nature-Action Québec
  
  
• Fanwort (Cabomba caroliniana)
  Invasive aquatic plant
  Global Invasive Species Database
  Ontario's Invading Species Awareness Program
  
  
• Flowering rush (Butomus umbellatus)
  Invasive water garden plant
  Global Invasive Species Database
  Ontario's Invading Species Awareness Program
  Nature-Action Québec
  
  
• Goldfish (Carrasius auratus)
  Invasive aquarium / water garden fish
  Global Invasive Species Database
  
  
• Hydrilla (Hydrilla verticillata)
  Invasive aquatic plant
  Global Invasive Species Database
  
  
• Mosquito Fish (Gambusia Holbrooki)
  Invasive water garden / pond fish
  Global Invasive Species Database
  
  
• Oriental mystery snail (Cipangopaludina chinensis)
  Invasive aquarium snail
  Global Invasive Species Database
  
  
• Parrot feather (Myriophyllum aquaticum)
  Invasive aquatic plant
  Global Invasive Species Database
  
  
• Red-eared slider (Trachemys scripta elegans)
  Invasive aquarium / water garden turtle
  Global Invasive Species Database
  
  
• Reed canary grass (Phalaris arundinacea)
  Invasive water garden plant
  Global Invasive Species Database
  Nature-Action Québec
  
  
• Rusty crayfish (Orconectes rusticus)
  Invasive aquarium / water garden fish
  Global Invasive Species Database
  Ontario's Invading Species Awareness Program
  
  
• Snakehead (Channidae (Family))
  Invasive aquarium / water garden fish
  Global Invasive Species Database
  Ontario's Invading Species Awareness Program
  
  
• Water chestnut (Trapa natans)
  Invasive water garden plant
  Global Invasive Species Database
  Nature-Action Québec
  
  
• Watercress (Rorippa nasturtium-aquaticum)
  Invasive water garden plant
  Global Invasive Species Database
  Nature-Action Québec
  
  
• Water hyacinth (Eichlornia crassipes)
  Invasive water garden plant
  Global Invasive Species Database
  
  
• Water lettuce (Pistia stratiotes)
  Invasive water garden plant
  Global Invasive Species Database
  
  
• Yellow floating heart (Nymphoides peltata)
  Invasive water garden plant
  Global Invasive Species Database
  
  
• Yellow iris (Iris pseudacorus)
  Invasive water garden plant
  Global Invasive Species Database