ninespine stickleback, pungitius pungitius, tiny freshwater ornamental fish in crystal clear water of european nature biotope

adult algae animal aqua aquarium aquatic biotope clear close crystal current ecology europe european fauna fish fishkeeping free freshwater funny gasterosteidae gravel grey habitat ichthyology instinct local macro native natural nature ninespine ornamental plant protection pungitius river sand setup shy space spine stickleback tank temperate threat tiny ukraine underwater vegetation water weed widespread wild