at what water temp does fishing shut down?

[bulletbob]

I know that it depends on species of course...
However, we know that ling, Cod, Pollock, etc are cold water fish as were Whiting when we still had them around... Just wondering at what temp do even these cold water fish "turn off"

I recall years ago in the late 70's early 80's, we had a very cold winter one year, and the mid winter inshore fishing had slowed to a crawl.. I remember reading in I think the NJ Fisherman a head boat captain saying something to this effect..
"The water temps are below 39 degrees, and that usually really shuts down even the whiting and ling fishing"... The temp quoted may have been 36 degrees, I don't recall exactly, it was over 30 years ago.. Just remember though as you sit at home the next 6 or so weeks freezing and fishless, its happened before even when there were tons of "winter fish" around..
any thoughts on when its time to just call it quits, regarding water temps?... bob