monkey goby on sand bottom behind oak leaf litter, cute tiny freshwater wild caught in southern bug river and domesticated fish

active adaptable animal aqua aquadesign aquarium aquatic biotic biotope blur bottom brackish bug captive caught clear closeup conditions controlled curious cute deathly decorative destructive domesticated driftwood ecology ecosystem endemic fauna fish fishkeeping fluviatilis free freshwater gobiidae goby gravel harmful highly hobby invasive juvenile leaf light litter local low monkey mood nano native natural nature neogobius oak pontocaspian predator rare river sand southern space species tank temperate threat tiny underwater unusual water widespread wild wildlife young