kribensis12
I know where you live
I talked to my teacher today and i saved the labs in exchange for 3 swordtails and 1 mollie, 1 filter, and a free tank cleaning. I put them in my 30g with a jewel cihlid. I feed them flake and they act like they have never seen food before. The are very skinny, you can see a upside down u indention on there stomach from lack of food. They are actually 4 to 4.5 inches. They do not have a very yellow color to them which i am contributing to the fact that they were left without food. They seem to be doing fine.
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The only reliable way to sex yellow labs is to vent them, but I wouldn't worry about that at this point, it would likely be too stressful for them. Their mouths look fine to me, they probably just seem big because the fish are so skinny. Here are a couple of pics of well fed labs.