what kind of a fish do I have!?

Question
I have a pond, but my question is about a fish that is in the pond and must have been transported there when I put in live plants - water hyacinth.  I dont know if it is from an egg or a live bearer, but i have found several of varying sizes, the smallest I am barely able to see with naked eye.  I took one of them out which is semi see through but gray in color, apparently from a northern temperate climate, freshwater and has same body type as a sunfish or perch.  Fins have no barbs. Thanks for your help with this.

Answer
Hi Mike;

It could be a mosquito fish (Gambusia). Here is a profile page as well as a link to pics of them;

http://www.fishbase.org/summary/SpeciesSummary.php?id=3215
http://www.fishbase.org/Photos/ThumbnailsSummary.php?ID=3215

At Your Service;
Chris Robbins