What follows is the Sport Fish Advisory Board's (SFAB) comment on marked coho/chinook fishing in southern BC, at hatcheries, by DFO for 2020 and succeeding years.
If you follow what I write, you would know there are a couple more things that would make a big difference: saltwater netpens with 2 million marked, sterilized (diploid or triploid) chinook each, of stocks that circle the Straight of Georgia (SOG) for part of their life cycle. This includes Cowichan, Harrison, and Nanaimo chinook. 12 netpens for 10 years minimum. Also, Nitinat and Robertson for Juan de Fuca.
The reason for netpens is that the fish return to the site of the netpen and do not go back into a river. Hence there is no genetic degradation because hatchery fish are not as 'robust' as their wild confreres. And marked, sterilized ones don't interbreed. A terminal fishery can mop them up when they return. In addition, immature marked fish can be kept, while wild ones released to go on their ways.
And only wild ones would go back into rivers. No epigenetics problems.
Here is what the SFAB has to say. It is worth reading, so do go and read this three page summary: https://sportfishing.bc.ca/wp-content/uploads/2020/04/2020-SFAB-perspective-on-Mark-Selective-Fisheries-and-Mass-Marking.pdf.
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