Can't speak to where the fish are, I haven't been able to find them.
As for the slush - I can speak to that. We travelled out of old cut to the middle of the bay as well as in close to the east. We ran into 2 bad spots - the one was pretty bad. Talked to couple of others who also found some bad spots. Its best to take a couple of machines if you can along with rope and shovels. I think its best to go slow and steady and as soon as you get into slush stop - then you can back out without getting buried. I believe there are slush spots all over the bay. Your best bet might be to follow the main paths out to the fishing areas and avoid the slush altogether.