Thanks to @George1 's brain health people, I read a little more about diet and, of course, oily fish.
It turns out that you get more Omega-3 if you buy tuna in water or brine. If you buy it in oil, the good stuff leaches into the oil, which most people pour off.
PS The forum software helpfully observed that this topic is similar: RIP Tina Turner
Also the oil is cheap high omega 6 oil. It has been shown to oxidise after 3-6 months so best in brine or spring water and then add your own real oil to suit.
āCodfish City Limitsā was quite a good song; not so sure about āWe Donāt Need Another Herringā or āLetās Ray Togetherāā¦
I got poisoned by tinned tuna in a salade niƧoise on a crossing to St.Malo in 1993. During the night crossing, my tonge turned bright green and swelled so much, OH thought it might have to be a medical emergency but it lessened. Few weeks later, tried tinned tuna again and even worse effects of the first reaction so doctor said never touch it again and I havnāt. How I still long for a tuna and mayo sandwich. Tinned salmon is fine but twice the price.
I did not know that! I will be aware next time.
Having said that, with fresh Tuna readily available now, tinned is a far behind second bestā¦ 
We have had amazing tinned and jarred tuna in Spain. We use the oil to make our salad dressing. Spain seems to specialize in canned fish of all sorts and much is of excellent quality.
Again depending on the oil used.
Exactly. Iād probably trust the more expensive brands like Ortiz, but if the oil is being used to preserve then itās likely to be of lower quality and older (as you said above) than what I have in my pantry.
Donāt forget āBetter be cod to meā, āGoldencarpā or āWhats Lamprey got to do with itā.
Iāll get me coat.
Just taking advantage of all the fishy experts gathered here. Yesterday I tried to buy Julesā normal tins of sardines in tomato sauce, sometimes varied to be in olive oil if the supply is low, and there were odd different tins all over the almost empty shelf.
So I bought him a selection which included ācitron huile dāolive riche en omega 3ā. Opened and emptied the first tin and there was a soggy slice of lemon inside, which I removed and discarded.
The next such tin is a bit further down the stack so my question is āis sliced lemon ok, or otherwise for dogs?ā before I get to it. 
Cannot comment of doggy suitability but I suppose like our dog they only eat what they smell as ok with taste coming next. As to adding a slice of lemon, maybe as an antioxidant it could slow down or prevent oxidation of the oil in the can maybe.
My guess would be itās just for flavouring. 
Me too but there could also be a side effect possibly.
My wife has been told to stop all antioxidants during her radiotherapy as antioxidants help cells repair and the radiographers are trying to damage cells with the aim of wiping out and further cancer cells.
Glad everything is being considered from all anglesā¦ to obtain the best outcome.
Thank you Stella, fortunately Guys cancer unit is a fantastic resource with excellent doctors and professors.
Iām inclined to go along with that, but have in mind that some things, like chocolate for instance, are not suitable, even dangerous, for dogs. Iāll have to go back to the vet and ask I suppose, irritating because I was only there yesterday picking up his pills and it is 15 kms away. 
A quick google says No, due to certain compounds much like lemongrass which is highly neurotoxic
Iāll continue chucking it out then, I think the olive oil and fishiness will cover the rest. Only 4 more cans to go.
That is what I had for lunch, too. Strange coincidence.
I also didnāt fancy the soggy lemon slice.
And hereās me thinking you were a cat person, oh, of course, fish, say no more. 
