monkey goby, wild caught brackish fish on green algae bush, sand bottom, southern bug river biotope aquarium, highly adaptable

neogobius fluviatilis juvenile goby gobiidae pontocaspian exotic masking temperate freshwater coldwater endemic rare nature water clear natural aqua biotic animal aquatic harmful destructive fishkeeping underwater weed cladophora decorative fish tank gravel local ecology threat unusual fauna widespread deathly aquadesign nano swim wildlife captive controlled conditions driftwood ecosystem space blur glass refraction shallow dof