(3) The second angel poured out his bowl into the sea, and it became like the blood of a corpse, and every living thing died that was in the sea.
The second trumpet warning (8:8-9) was also about sea-to-blood conversion. The effects of the warning were the death of a third of the sea creatures, and the loss of a third of the ships.
The idea that the sea became as the blood of a dead man is a vivid image of the vast amount of blood shed of the very people who shed the blood of the Lamb of God; it was enough blood to fill an ocean, figuratively speaking.
“Every living thing died that was in the sea.” If this was literal, no fish would exist today! Yes, but this is symbolic. It is a figure of the completeness of the fury of God upon the old covenant people. It sits in contrast to the second trumpet warning which affected “a third” of the sea. The people did not heed the warning and repent of their sins (9:20-21); therefore, the other two-thirds are punished now, completing the whole.