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Subject: Re: Salmon weights
From: Marc Trudel <[log in to unmask]>
Reply-To:Scientific forum on fish and fisheries <[log in to unmask]>
Date:Thu, 9 Mar 2000 09:59:02 -0800

text/plain (51 lines)


here's a paper you may want to look at for size trends in Pacific salmon:

Bigler, B.S., D.W. Welch, and J.H. Helle. 1996. A review of size trends
among North Pacific salmon (Oncorhynchus spp.). Canadian Journal of
Fisheries and Aquatic Sciences 53: 455-465.



John Gilbey wrote:

>I agree marine survival is a major problem, but just one of many. I repeat,
>the fishing effort has dropped in recent years but the returns stayed down.
>Further, have you any evidence for lower body weights in returning salmon?
>would be very interested in some references. I have seen no data to support
>this view.

DFO's work includes a huge amount of research into Atlantic and Pacific
salmon, yet weight-at-age and size-at-age data I have yet to find. I have
been "told about" a 20 year study that was done on a couple of Alaskan
salmon stocks that showed a declining trend in weight-at-age, but have not
actually seen it. Apparently it was done at the Auke Bay Lab - I've had a
fairly lengthy discussion on this topic with a fisheries manager from
Alaska which is posted on my website:  ...but, no, I have not seen that

Marc Trudel
Department of Fisheries and Oceans
Ocean Science and Productivity Division
Pacific Biological Station
3190 Hammond Bay Road
Nanaimo, British Columbia
Canada V9R 5K6

tel:      (250) 756-7018
fax:     (250) 756-7053
email:  [log in to unmask]

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