monkey goby juvenile rest on sand bottom and open fins, clever tiny freshwater wild caught in southern bug river and domesticated

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