stone moroko, invasive freshwater dwarf fish from east asia, common roach highly adaptable and enduring species

pseudorasbora parva adult gobioninae cyprinid aquarium river asian aggressive widespread topmouth gudgeon rutilus cyprinidae endemic potamogeton water clear curious natural aqua biotic animal aquatic harmful destructive wild caught fishkeeping underwater weed decorative fish tank gravel local native omnivorous predator driftwood sand ecology ecosystem threat organic pollution unusual fauna aquadesign nano swim wildlife dangerous