The lake at Waimea Bay fills up annually and floods the roads upstream due to the hard Winter weather's rains. A river eventually emerges and carries all this dirty water to the ocean. It's a natural process. The water from the river gets carried away overnight by the currents; no ocean fish get harmed. There are also no fresh water fish harmed because they stay in their natural habitats; all this water is from rains, not an occupied river or lake.