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If I'm doing salmon fillets then I'll normally do 50c for 25 minutes, but a whole salmon is a different kettle of fish. I've done sous vide whole salmon on several occasions and I do 55c for 3 hours which works fine but dries out the fish a little more than I'd like.

I'm not really comfortable cooking anything at a temperature lower than 55c for long periods of time but I'd like a less dry whole salmon.

Does anyone else have any views / science on this one? Could I get away with doing a whole salmon at a lower temperature?

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Are you using a boiling pot of water on the stove, an oven or an immersion circulator? –  Loki Aug 20 '14 at 9:38
    
An immersion circulator. –  Will Calderwood Aug 20 '14 at 9:39
    
Oh that's good. So you can rule out temperature control being an issue. I would recommend using poaching temps for whole salmon (I think you're doing that already) and adding a bit of court bouillon in the bag before you seal it. Since doneness is not the real issue in an immersion circulator at a controlled temperature, if the end product is dry the only way to remedy that is to add more liquid in the beginning. –  Loki Aug 20 '14 at 9:45
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Yeah, cook it at a higher temperature, say 65C to a core temp of 55C. You'll get a mild doneness gradient but not much. I don't suppose you have access to the iOS app Sous Vide Dash? It'll work out the time it will take based on target temp, water temp and the thickness of your salmon. –  Stefano Aug 20 '14 at 11:05

2 Answers 2

If you want to keep the texture of slow-cooked food at 50°C, then depending on your religion and AA status, you might add 1 glass of white wine per Kg of salmon.

Disadvantage: the alcohol will not evaporate at all!

Advantage: The alcohol will not evaporate at all and give additional flavour to the salmon!

Personally, I use 25% fresh dill (leaves only) and 75% white wine and as alcohol is a natural disinfectant, cooking longer times at 50°C is absolutely no problem but obviously, this is not a dish for kids... Afterwards, I use the little wine that was not soaked up by the salmon to create a wine sauce that goes on top of the fish. I use the dill stems here and remove them before serving. In the sauce, the wine does get up to boiling point.

One last tip: don't use the cheap cooking wine, but a good wine that you could serve to your guests too. I personally use a Pouilly-Fuissé to slow-cook the salmon in and to serve at the table...

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Personally, I also clean my hands, immersion circulator and any utensils used in slow cooking with rectified spirit before and after each use... :/ –  Fabby Apr 16 at 14:27

Whole salmon simply isn't a great candidate for low temp cooking in a water bath. While you can achieve excellent results with portioned salmon, cooked at 50C for well under an hour, this timing is impossible for a whole fish. It would be necessary to cook much longer. The problem is you would probably have to cook the whole fish for a couple of hours. This causes the enzymes to break down the flesh and you get a mushy, unpleasant product. Alternately, as you experienced, raising the temp to speed things up results in a dried out product.

I would choose a different cooking technique for the whole fish...or portion your salmon into steaks or fillets and look here: http://www.chefsteps.com/activities/sous-vide-salmon--2

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