[null and void]

A third of the waters made bitter?

[James C. Bennett]

Rotting fish would make the waters more tangy, with all the decomposed protein / uric acid...

[piytar]

First thought that came to me, but Rev 8 isn't exactly ambiguous:

“6 Then the seven angels who had the seven trumpets prepared to sound them.

7 The first angel sounded his trumpet, and there came hail and fire mixed with blood, and it was hurled down on the earth. A third of the earth was burned up, a third of the trees were burned up, and all the green grass was burned up.

8 The second angel sounded his trumpet, and something like a huge mountain, all ablaze, was thrown into the sea. A third of the sea turned into blood,

9 a third of the living creatures in the sea died, and a third of the ships were destroyed.”

Haven't seen hail and fire mixed with blood, a third of the earth burned up, a third of the trees burned up, all the green grass burned up, or a third of the sea turned into blood. So I'd have to say nope, this is just some freaky environmental thing. Unless, of course, there is a mistranslation. And didn't a good chunk of Israel just go up in smoke?

[Jet Jaguar]

Yep.