royal pleco swims gracefully displaying its intricate markings and vibrant colors against a pure white backdrop

royal pleco panaque nigrolineatus freshwater fish aquarium tropical exotic species colorful ornamental anatomy aquatic life patterns plecostomus habitat behavior care fishkeeping culture aquarist identification enthusiasts marine biology biodiversity environment nature discovery wildlife underwater world ecosystems pet setup maintenance breeding diet aquariums tanks adaptation hobby aquaristics pets coloration fin structure creatures ai generated