Prime spawning females are 19"-24" any protection of the plus 25" fish is misdirected. Please look at the discussion board at OHIO STATE SEA GRANT and read the posts by Fred Synder, who is one of the most repected guys in the field. For anyone interested in this or related subjects this website is a god send. Just search ohio state sea grant and find the discussion board and get answers based on science and experience. These people have both not just the science.
In a nut shell young females produce good viable young. Old females produce less viable off spring. It is the same with apple trees, cattle, humans, etc. Just because the 13 1/2 pounder is filled with eggs doesn't mean she will spawn successfully and chances are she won't. About 1 in a thousand eggs survive even healthy young females. The older ones just are not successful.
Also this web site is full of nice to know facts about growth rates, walleye and perch, spawning trawl census and alike.
Please look and get the facts right from the horse's mouth.
Sincerely
Greg
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