In the first Bitter&Twisted Guest Ticket spot for ages Euan McGrandle gives his considered view of the countrywide failure of C&R, in particular with the forced return of fresh silver salmon, and the refusal of the Angling Press to even consider and discuss the cause.
Foreword by Euan
I actually wrote this article over a year ago in the vain attempt to at least get a conversation started on the merits or otherwise of releasing silver fish straight from the sea. I have approached both Richard Baker from Trout and Salmon magazine and Mark Bowler from Fly fishing and Fly tying magazine, and although both initially engaged with me, didn’t want to put the question in print.
The article is controversial, I’ve no doubt about that, and a good many people will read it and dismiss it as rubbish…… but is it?
The article highlights the dangers of just listening to certain individuals stating their opinion in the knowledge that nobody will question them, and in many occasions if questions are asked they are ignored or even retribution initiated against the person asking.
Please read this with an open mind and after reading ask yourself the question. Is a salmon or sea trout fresh from the sea able to reproduce after being caught and released?
I’ve researched for a long time and cannot see anywhere that a fish which has been released has gone on to successfully spawn. If there is actual evidence of this – somebody please share where it is as I cannot find it.
I’m certain the fishery scientists and those politicians employing them will claim “of course C&R works” however rather than just taking this statement at face value as someone’s opinion, can they actually “PROVE” that it works – as in fact a true scientist should do..
All I have researched has strengthened my opinion that C&R of silver salmon and sea trout does no good whatsoever and potentially is one of the major causes of the current predicament wild salmon find themselves in.
Euan McGrandle July 2025
How Effective is Releasing silver Salmon & Sea Trout?
As I fruitlessly continued to search for some scientific studies regarding the efficacy of Catch & Release for migratory fish, I again was left wondering about our fishery scientists and exactly what they deem to be beneficial research.
We have now been approximately two decades where the release of salmon was first recommended, then expected and finally made compulsory by law. Surely at least one scientist in that time would have deemed it necessary to actually assess whether or not C&R actually has a positive or detrimental effect on the survival of wild salmon and sea trout.
Apparently not…
Let’s move away from the subject briefly and consider the relatively recent “Follow the Science” rhetoric applied to the handling of Covid 19.
At the very beginning of the outbreak, information was sparse but then came the differences of opinion with some respected “expert” scientists claiming that only those vulnerable need to be protected and different respected “expert” scientists saying that everyone in the population needed to be protected, as it was the most deadly virus since the Spanish Flu.
Well, we all know what happened… Politicians deflected responsibility to certain “expert” advisors, any scientists who spoke against lockdown measures were marginalised, ostracised and essentially cancelled and the only narrative allowed was that of making Covid the disaster certain people demanded. The media daily spread fear, and lockdown duly came.
Not to labour a point we are all too familiar with, subsequent inquiries have shown that for the overwhelming majority of the population the Covid virus was no worse than a bad cold (just as those scientists who spoke against lockdown stated), and the cost of lockdown will be a long time to pay back – possibly not even in my lifetime.
What has all this to do with C&R? On the face of it not a lot, however it highlights the dangers of blindly “Following the Science” without actual proof of effectiveness.
So – back to the release of migratory fish, and since it has been passed as law in Scotland, let us consider the spring salmon.
Despite extensive research, I have not been able to read one paper, anywhere in the world, where a spring salmon is caught by rod & line, the fish subsequently released to spend the summer in fresh water and to go on and successfully spawn.
This is quite a statement!
Of all the thousands, or tens of thousands of spring salmon which must have been released, there is not one of these fish which has been shown to have gone on to successfully spawn. Or if there is, then the paper must be extremely difficult to find.
What is very easy to find are numerous peer reviewed papers detailing the effect of stress on salmonids and its impact on fertility. This point has been raised numerous times previously and always the same dismissal of that fact occurs, but not one shred of evidence is offered which disproves or even contradicts that stress negatively impacts salmonid fertility.
Another fact that is very easy to find information on is in the cortisol levels of both smolts migrating to sea and adult salmon returning to fresh water. In both cases this is the highest occurring naturally in any animal. Clearly nature has adapted migratory fish to cope with this, but not additional stress. How much stress is inflicted on a fish being hooked, played to the point of exhaustion, removed from the water for photographs and then released. I certainly don’t know, but nor it seems to those scientists who promote the release of spring salmon as being the correct thing to do.
The question has also been previously asked, as to how many released salmon survive for more than a day or so before dying, and of those which do actually make it to the redds eventually, are any of them capable of actually producing fertile eggs or milt? Again, I don’t know the answer, nor it seems do any of the scientists we blindly listen to and assume they’re speaking the truth.
Let’s go back to Covid for a minute and reflect on the Christmas when we were banned from gatherings and when the rhetoric of fearmongering was at its most extreme. This was the very time some politicians decided to stick two fingers up at the rules and have parties (yes multiple parties and not just by the conservatives). Whilst this has sparked outrage amongst the population (rightly so in my opinion) the real question that seems to constantly be overlooked is WHY did these people think it was safe to have the party. Apparently they weren’t listening to the same narrative the media was inflicting on the remainder of the population, and in all likelihood knew that danger from Covid was negligible for healthy people. So – perhaps what scientists and politicians know isn’t necessarily what the general public is allowed to know.
Okay – back again to the effects of stress on spring salmon.
If I can find papers highlighting stress with a simple Google search, it’s inconceivable that intelligent fishery scientists haven’t also read these papers. Why then has there been absolutely no effort to try and quantify the effect of stress on salmon released, or indeed research how many released salmon actually make it to the redds (even assuming for a second that they are capable of reproducing)?
On speaking to acquaintances in the aquaculture industry, the broodstock sites treat the fish with kid gloves during the transition from salt to fresh water as it had been long established that any interference had a negative impact on egg survival. Nowadays even walking past the holding tanks during this time is frowned upon. Clearly the salmon during this transition is vulnerable to stress. By how much, I’ve no idea but undoubtedly it’s a known factor.
As with the papers on stress in salmonids, I find it unlikely that if I can easily find out this information, fishery scientists don’t know this. Could we be looking at a similar situation to the Partygate instances where the truth is known by scientists and politicians but we the public are treated like mushrooms?
Being a scientist myself, I would have previously thought it inconceivable that similar minded people would perhaps not tell outright lies, but deliberately conceal the truth. This viewpoint was changed when I watched the Australian senate inquiring as to the effectiveness, or dangers associated with the Covid vaccines. Both Pfizer and on another occasion Moderna senior scientists were questioned, and whilst it is unlikely they lied to the senators, it was cringingly embarrassing to watch the clear avoidance of answering the actual questions which were being asked (sometimes the same question multiple times). So if respected scientists are prepared to avoid telling the truth about matters concerning human health, is it possible that scientists also conceal the truth about salmon if those paying salaries instruct them to do so?
Again, I don’t know but hopefully not.
In conclusion, although I’ve made some direct criticism of scientists, I would really like to be proven wrong and someone is able to show me a documented study of whether rod caught and released spring salmon successfully spawn or not. By successfully spawning, I don’t mean that they merely went through the act of spawning, but rather that the offspring survived in similar numbers to fish which hadn’t been hooked and released.
Merely going through the motions of mating is no different to a human who has had a vasectomy or hysterectomy. The act of mating in itself isn’t evidence of a successful spawning, rather it’s the amount of juvenile fish which hatch out.
Although what I have written on re-reading would appear that I am against all Catch and Release, this is not the case. Ever since the 1970’s, my father showed me how to safely return coloured salmon and sea trout, and I know of many instances where fish being obtained for hatcheries are caught by rod & line. I believe that any impact of stress at this advanced stage in development of eggs or milt would have been observed so in all likelihood so release of coloured salmon has a positive (or at least not a negative) effect. The same cannot be said for silver fish straight from the sea when the physiological change is occurring.
We hear the oft quoted mantra of “Deid fish cannae spawn” and whilst I concede this fact to be true, it’s also true that a fish used as a food source rather than a plaything can’t cause any harm either. Anecdotally, every system which has introduced C&R has seen catches decline much faster than before it was implemented – especially the spring component of runs. In fact I have not been able to find one river where catches have even remained steady once compulsory C&R has been implemented.
I will happily retract anything written here and offer an unreserved apology to all concerned if such a study has indeed been carried out and documented, once I have a chance to read and review said document.
If such a study has not yet been conducted – why on earth not?
If this is the case is it not about time that a detailed study is done with some sense of urgency so that we can conclusively know if Catch & Release has a beneficial or detrimental effect on salmon survival whilst there are still wild salmon left to study. In my opinion there’s nothing that fishery scientists could do that would be of greater importance.
Euan McGrandle.
June 2024

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