problem: there is too many ants on my sea

[quill0]

hello everybody,
here the screenshot:


As you can see there are many many little black dots on the sea, on one frame it is not so deconcerting but during the play all this details are moving creating a sort of digital noise. very unpleasant. Have you got the same strange thing with the game, is there any solution?
so i checked up all this parameters:
_it is not the mod, because it is the same thing with the 1.4 version game.
_this is not the anti aliasing, i play on AA 8X and 16x Anisotropic Hd (you can see the perfect line of the boat)
_ my frame rate is about 60 fps
_i checked with or not the adaptativ anti aliasing option
_i test with or not the filter photographic and all the graphic option of the game (realistic sea, gamma...)
_i am in full resolution 1280x1024 (at 60hz or more)
my graphic card is a gigabyte Ati 4800hd serie and with the other video games i haven't got this problem. i play on Silent hunter 4, v1.4

thank you for reading and helping me