school of chevron barracuda sphyraena putnamae in blue water above a tropical coral reef

andaman animal barracuda barracudas biodiversity blackfin blacktail chevron coral diving ecosystem environment fish hunter indian indonesia islands koh marine ocean pacific predator qenie reef richelieu rock saltwater school schooling scuba sea shoal silver similan sleek sphyraena surin tachai thailand triangle tropical undersea underwater wild wildlife