many black kokanee (oncorhynchus kawamurae), or kunimasu fish

animal invertebrate wildlife fish underwater seafood food reef aquarium coral organism leaf nature flower black kokanee oncorhynchus kawamurae kunimasu actinopterygii animal aqua aquatic beautiful kokanee blue bright catch close-up closeup colorful crowd decorative deep dive ecosystem environment exotic fish fishing idyllic kunimasu nature kawamurae predator salmon salmonidae swimming