clean sea water on dunu beach

indonesia fishermen lake river fish caught quality waters clean clear barramundi latidae mahi-mahi coryphaena hippurus sardines tuna skipjack catching biota live bottom column surface freshwater brackish water sea developing countries equipment sophisticated technology slum wooden boat laborer education health environment net weather famine electricity septic tank gap rich access capital extreme disease pollution cleanliness school culture islands drought rain remote isolated transportation traditional village accident disaster fire flood indigenous poverty