gudgeon adult male swim over oak leaf litter and driftwood, blurred hardscape, wild caught, domesticated bitterling fish

adult algae amarus animal aquadesign aquarium aquatic background barbel biotope bitterling blurred body captive caught clear closeup coldwater color concept current cyprinidae decoration dof domesticated driftwood ecology european fauna fish fishkeeping free gobio gravel gregarious grey gudgeon habitat hardscape ichthyology inspiration instinct leaf light litter local low macro male mood native natural nature oak omnivore ornamental predator protection rhodeus river ryoboku sand shallow slender space spawning swim tank temperate threat ukraine underwater vulnerable water widespread wild