I remember this book because I read it back in 2009, though I do not remember the plot at all.
I decided to read this again to fill my time. It did have potential for a creepy horror. Unfortunately, though the plot built up fine; the ending was very disappointing. No explanation of the background of the creepy carnivorous fish, or the shark-teeth man who was giving them away.
Apparently this is also part of a "Creatures" series. I think I might check another one out, however, if it leaves me disappointed again, then I won't continue to seek the rest