Worm colonies?

[Ctah_Lu]

I have kept slugs for the winter. Use a chinese food container, fill with dirt, add lettuce and place in the fridge. You can also collect eggs when you find them. Pull them out every so often, add fresh lettuce, air and warmth. Stick back in fridge. If you collect enough, you won't even have to worry about them reproducing. They will live in the fridge all winter.

How many slugs are enough and what kind of slugs do you have?, I have colected only 5 slugs and my slugs look like this: