ninespine stickleback, pungitius pungitius, funny but hard to keep in aquarium freshwater wild fish swims in dense vegetation

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