Roe bags, great information from everyone who posted above.
I like to hook my roe bags not from the top where they are tied, but through the side, its easier to pull them off, but they do rip when setting your hook on leaves, either that or I'm setting to hard
As for roe, I like to keep my roe gooey, while I store them I will pop a few eggs and have the juices soak my tied bags. I flip the container over each day so it cycles, I'm sure it doesn't make much of a dfference , but in slow moving water, I beleive scent is a major factor for the fish. I also use a scent on some of my plastics.