The movie's name is The Lady from Shanghai (1947), the script was written by Orson Welles. It's a great movie, a classic one, well, at least that's what I think of it. Despite the long time i don't watch this movie, this lines got me:
Michael O'Hara (Orson Welles): Once, off the hump of Brazil I saw the ocean so darkened with blood it
was black and the sun fainting away over the lip of the sky.We'd put in
at Fortaleza, and a few of us had lines out for a bit of idle fishing.
It was me had the first strike. A shark it was. Then there was another,
and another shark again, 'till all about, the sea was made of sharks
and more sharks still, and no water at all. My shark had torn himself
from the hook, and the scent, or maybe the stain it was, and him
bleeding his life away drove the rest of them mad. Then the beasts to
to eating each other.In their frenzy, they ate at themselves.You could
feel the lust of murder like a wind stinging your eyes, and you could
smell the death, reeking up out of the sea. I never saw anything
worse... until this little picnic tonight.And you know, there wasn't
one of them sharks in the whole crazy pack that survived.