Wendy:

Take a look at:

Simulating winter flounder population dynamics using coupled
individual-based young-of-the-year and age-structured adult
models 1.
Kenneth A. Rose, Jeffrey A. Tyler, R. Christopher Chambers, Grace
Klein-MacPhee, and Donald J. Danila

Can. J. Fish. Aquat. Sci. 53: 1071–1091 (1996)

You can get this in electronic form at

http://www.nrc.ca/cisti/journals/cjfas.html

I understand that the CJFAS will be restricting its electronic
availability to paying customers very soon.... so hurry!

--
Richard G. Dudley

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http://home.indo.net.id/~rdudley