Yes, Bernie, there are several explanations for catching the same fish twice. 
In my own world as a wildlife biologist, it's called "catch-and-release" and 
"mark-and-recapture"; the fish (or other wildlife such as rabbits, deer, mice, 
insects, crustaceans, whatever) is caught, then tagged before release. 
Subsequent catches of the tagged fish or other animals are measured against 
catches of the same species which are not tagged. After a certain number ("N") 
are caught and again released, a formula called the Lincoln-Peterson Index is 
applied to determine population numbers.

Now, one might reasonably ask, how does a Lincoln-Peterson Index apply to 
recapture of a long gone, then reappearing DX entity such as South Sudan, I 
have no idea, at least not yet. Working on it... I'm still trying to recapture 
QSLs from QSOs in the early 1990s. For example, I made contact with only a 
single station from Rhode Island during my 2001 and 2004 mini-dxpeditions to 
VO2 despite repeated efforts. This one station responded to my CQ RI but never 
responded to my repeated QSL requests (I sent him SASEs, green stamps, even $5 
GS, and letters) but no response thus denying me WAS from VO2. Using the 
Lincoln-Peterson Index (N=1), I would calculate that Rhode Island no longer 
exists, has gone extinct, HF-wise. Yet, insists that RI has a ham 
population of 2263. Such are the vagaries of both wildlife and ham radio 
populations and contacts.

You win some, you lose some, but you keep playing the game.

73 de Fred Stevens K2FRD
Previously VO2/K2FRD
VO2FS to be QRV in summer 2012

At 7:00 PM -0400 9/7/11, Bernie McClenny, W3UR wrote:
>Professor Cass taught before the DXCC 2000 rule change, but I suspect
>there must be something that explains catching the same fish twice.  The
>man was a genius!  Guess I'll have to re-read the book, again!
>Bernie McClenny, W3UR
>Editor of The Daily DX, The Weekly DX and How's DX?
>Get a free two week trial of The Daily DX and The Weekly DX
>-----Original Message-----
>From: [] On Behalf Of Don Berger
>Sent: Saturday, July 09, 2011 6:18 PM
>Subject: Re: [DX-CHAT] South Sudan
>I still have all the West /Coast DX Bulletins but couldn't find the
>reference to catching the same fish twice!

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