School of small brown coloured fish swimming near the bottom of the ocean with rocks covered in barnacles and sea plants in the background

oceanography underwater fish barnacles swimming sea marine marine life swell current tail gills clear water nature wildlife aquatic species reef scales pectoral fins fins calm clear saltwater deep nobody ocean scuba diving school shoal tranquil indonesia aquarium closeup scuba diving snorkeling coral ecosystem conservation sand sea plant cleanse rock brown black dark red peaceful