Wish you had a picture of them but I would bet they are probably tadpoles (baby frogs). They usually hatch out by the hundreds from a jelly like mass of eggs near the edge.
Shocking would do them in but I would be more inclined to try to net them into a bucket of water and take them to a pond or creek somewhere. Either way --- dead or alive you need to get them out of your pool.
http://en.wikipedia.org/wiki/Tadpole
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