background Bonneville dam bradford island columbia river dam fish fish ladder fish steps fishway locks oregon reflections river water waterfall alligator-gar-fish ambush-predators animal aquarium aquatic atractosteus-spatula carnivores distinctive-snout elongated freshwater-fish gar habitat-destruction large largest-garfish piscivorous predator-fish primarily-piscivores primitive-fish river-fish riverine Singapore Southern-United-States stalking-predators torpedo-shaped unusual voracious zoo duck lake nature Plitvice beach fishing ocean rod sport 2016 animal. river Mud wetlands fat hobby man woman fur lazy mamal nap otter pelt sleep snooze artificial assist breeding help ladder leap mossy salmon steps stones art colorful colors colours drawing fins graphic illustration swim