ninespine stickleback, intelligent freshwater decorative wild fish show its spines, european temperate lake biotope aquarium

active adaptable adult animal aqua aquarium aquatic biotope caught clear closeup concept curious current decorative easy ecology europe european exotic fauna fish fishkeeping free freshwater funny gasterosteidae gravel grey habitat ichthyology instinct intelligent its keep lake local macro native natural nature ninespine ornamental plant protection pungitius river sand show shy space species spines stickleback tank temperate threat ukraine underwater vegetation water weed widespread wild