curious and active adult ninespine stickleback, tiny wild fish show natural behaviour inspecting temperate biotope

active adult algae animal aqua aquadesign aquarium aquatic behaviour biotope clear closeup coldwater creature curious current dof ecology europe fauna fish fishkeeping free freshwater gasterosteidae gravel grey habitat ichthyology inspecting inspiration instinct local macro native natural nature ninespine ornamental plant protection pungitius river sand shallow show shy space spine stickleback tank temperate threat tiny ukraine underwater vegetation vulnerable water weed widespread wild