can anyone translate that into an English expresssion? Is there something equivilant in English? I think there is, but I cannot think of it!
thanks!!

I googled your expression, and the closest I came to finding an equal English expression was "Save some for the fish." I don't know if that's a great equivalent, though.

Some other translations courtesy of Wikiquote at http://en.wikiquote.org/wiki/Spanish_proverbs were:
"If you don't need something, leave it for others to use."
"Don't take that which is not rightly yours."

One source I frequently use online is www.wordreference.com as a quick Spanish-English (and other languages) dictionary. It also has a Languages Forum component in which you can find translations for expressions, slang, nicknames, etc.

Hope that helps a little! I'm sure a native speaker might be able to give you some better translations for the expression.

water that is not to be drank,it should be left on its course.

like the water on a river for example.most expression in spanish or other languages do not fit well in others;its a peculiar detail. I speak 4 languages and it always happened when someone wants a translation from a LOCAL expression.