gudgeon swim to hide, clever tiny freshwater wild caught and domesticated fish in temperate river biotope aquarium, vegetation

gobio cyprinidae gregarious predator omnivore aggressive slender body barbel coldwater european ukraine pontocaspian nuphar lutea current captive water clear natural instinct aqua animal aquatic fishkeeping underwater habitat ornamental closeup fish tank gravel driftwood decoration ryoboku feel good sand native fauna macro widespread ecology threat nature protection algae space local grey ichthyology vulnerable blurred background inspiration gudgeon swim hide clever tiny freshwater wild caught domesticated temperate river biotope aquarium rich vegetation relaxing aquadesign low light