gobio gudgeon adult on sand bottom, freshwater wild caught and domesticated fish in temperate river biotope aquarium

gobio cyprinidae gregarious predator omnivore slender body barbel dirty water coldwater european ukraine pontocaspian current captive clear natural instinct aqua animal aquatic fishkeeping underwater habitat ornamental closeup fish tank gravel litter decoration ryoboku feel good sand native fauna macro widespread ecology threat nature protection algae space local grey ichthyology vulnerable blurred background inspiration research glass refraction gudgeon adult bottom freshwater wild caught domesticated temperate river biotope aquarium driftwood hardscape aquadesign murky dark low light mood concept