By Keith Fitz-Gerald Investment Director Money Morning/The Money Map Report We can almost hear that ominous "Jaws" theme music in the background and can see that huge dorsal fin as it slices threateningly through the water - knowing full well that the real terror is hidden beneath the water’s surface. But this time around, it’s not a "Great White" that’s sparking our fears; it’s a well-capitalized and broadly based series of secret stock exchanges known as "Dark Pools of Liquidity," "Dark Liquidity," or just "Dark Pools." Most investors have never even heard the term - and are truly shocked to discover these "off-the-books" trading networks actually exist. But to Wall Street insiders looking to anonymously move billions of dollars in stocks, bonds, and other investment instruments, dark pools are de rigueur - especially when you’re an institutional trader who doesn’t want ...