Can you ID these fish for us?

[sonicsink]

Hi everyone,

My kids and I recently caught a few fish that we can't ID and I'm hoping you old pros could help us out

The first one was caught in the St-Laurence river near Cornwall. Someone there told us it was a chub, however we've seen different looking fish also called chubs, so we don't know what to call it.
   

The second one is a sucker, but again not sure which kind it is.
   

The third was caught in the same spot. It's nice and silvery, but it seems some of the scales are a greenish-brown.
   

The fourth was also caught at the same spot and is what we have always known as a chub, but now we don't know.
   

Any insight would be greatly appreciated!