ninespine stickleback raise its spines to defend territory, tiny wild fish show natural behaviour in temperate biotope

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