Hey Gil, phone my cell
"Am I part of the problem or am I part of the solution."
Last edited by GLG; 06-02-2012 at 05:09 AM. Reason: spelling
"There are in fact two things , science and opinion,The former begets knowledge , the latter ignorance " Hippocrates
The Harper™ Government©: Winging it since 2006
Question here. Is there any evidence that young fish swim into pens because of the availability of food and then grow too large to leave?
“The Gods do not subtract from men’s lives - the time spent fishing.”
containment ponds typically yield <1% return rates so if that is what you are experiencing, you are at the norm. rearing channels, which also have the feed cut by about 75% have a much higher return rate but fewer smolt that survive before release. lots of variables in the raising of these smolt so the actual rearing practices could well be a major factor in very low return rates.
I'm no expert!!! Plain and simple. Just want answers. Reelfast, check the USA containment pond yields before salmon farms.... Are you sure they were 1%????? I'm under the impression you got greater yields from your hatcheries than that. Before fish farms? I'm sure Canadian hatcheries got better yields from hatcheries before the explosion of farms
Charlie already provided you with a link to paper that shows wild salmon populations near salmon farms are declining at faster rates than adjacent populations where there are no salmon farms. This paper is a global assessment.
GLG provided you with annecdotal evidence from the work he has done with one stock of coho.
Here is a link to a very recently published paper on Fraser River sockeye population declines; http://onlinelibrary.wiley.com/doi/1...2.00244.x/full
I know, it's not about coho but the methodology in this research could be applied to some local coho stocks if the data are available. That would be an interesting excercise. So let me put it to you: Accept the methodology and results of the sockeye paper and you do the work to apply it to coho. Could use Fraser River coho stocks and the same time frame to narrow the variables as much as possible. Then you could actually publish your results to prove the opposite.
I'm in agreement that there are many impacts that affect wild salmon stocks throughout their life cycle but I have to agree with others that recent harvest levels have been very precautionary and while freshwater habitat loss continues only at a much lower rate. Yet some coho stocks continue to decline. Therefore the question becomes what other impacts are there and what can be done about them?
Finally, and this is addressed to all, the proposed changes to the Fisheries Act will make it much more difficlut to protect and restore the habitat in many of those irrigation and roadside ditches that used to be salmon streams. This has got to be stopped!
LOL, almost impossible to grow to large to get back out of the farm pens from the inside of an Atlantics stomach.
Thanks for that link Cuttlefish; interesting stuff by some respected authors. Too bad we don't have better data on outmigrating wild juvenile coho, but that can be said for all salmonid stocks I suppose.