monkey goby, funny juvenile freshwater fish from southern bug river, swim to surface to catch insect prey in biotope aquarium

active adaptable animal aqua aquadesign aquarium aquatic biotic biotope brackish bug catch clear closeup curious deathly decorative destructive ecology endemic fauna fish fishkeeping fluviatilis freshwater funny goby gravel harmful highly insect invasive juvenile lips local monkey mouth nano native natural nature neogobius pontocaspian predator prey rare river sand southern species surface swim tank threat underwater unusual water weed widespread wild wildlife young