angelfish males ready to fight, artificial aqua trade breed of wild pterophyllum scalare cichlid in koi coloration, popular fish

adult aggressive amazon angelfish animal aqua aquaculture aquarium artificial background basin black brazil breed bright burhead business careful cichlid cichlidae clear closeup coloration colorful decorative design ecology elegant fauna fight fish fishkeeping freshwater habitat hobby instinct koi line little macro males nature ornamental plant planted popular protection pterophyllum ready red scalare smart solimoes species specimen sword tank threat trade underwater vulnerable water wild