ninespine stickleback, intelligent freshwater decorative wild fish lifts its spines showing territorial behavior

adaptable adult animal aqua aquarium aquatic behavior biotope captive caught clear closeup concept conditions controlled current decorative easy ecology europe european exotic fauna fish fishkeeping free freshwater funny gasterosteidae habitat ichthyology instinct intelligent its keep lake lifts local macro native natural nature ninespine ornamental perfection plant protection pungitius river roots sand showing shy space spines stickleback tank temperate territorial threat ukraine underwater vegetation water weed widespread wild