Who is choosing picnic tuna?

Salt-first picnic planners

If tuna is going into sandwiches, wraps or salads, compare salt per 100g on the exact tin rather than assuming its packing liquid tells you enough.

Low-fuss outdoor eaters

If draining a tin at the picnic would be awkward, a no-drain format may be useful. Its salt declaration still needs a separate check.

Shoppers feeding a group

For a shared picnic, check drained quantity and servings per tin as well as salt per 100g. Sauces and other ingredients also contribute to the finished filling.

What matters when choosing a tin?

Choose the concern that matters most for your picnic, then check the exact variant rather than relying on its brand or packing medium.

Concern What to check Who this matters to
Salt in the tuna Compare salt per 100g on the exact tin, using drained figures where provided; check ingredients for added salt. If I am making sandwiches alongside other salty picnic foods, I want to limit what the tuna itself contributes. About 38% of consumers put the tin's salt declaration first.
Easy outdoor serving Check whether the pack is labelled no-drain, its size and its instructions for leftovers. Opening tuna away from a sink makes draining inconvenient, so I may favour a pack I can serve directly. For about 23% of consumers, ease of serving is the primary need.
Portions for a group Compare drained weight, servings per tin and salt per 100g; consider the other ingredients in the filling. When several people are sharing wraps or salads, I need enough tuna without opening more than we will use. Group portions come first for about 23% of consumers.
Sourcing and texture Read any sourcing claim on the exact pack and choose a format suited to the planned dish; check salt separately. I may want chunks for a salad or a particular sourcing claim, while still checking the nutrition panel. Those preferences lead the decision for about 16% of consumers.

For a concrete label comparison, Sainsbury's declares 0.12g salt per 100g drained for its Tuna Chunks in Spring Water 4x145g, against 0.42g per 100g drained for its brine variant. That difference applies to those products, not to every spring-water or brine tin.

Common buying pitfalls

  • Assuming spring water means less salt

    The packing medium does not establish the salt level. The cited Sainsbury's spring-water tin declares 0.12g per 100g drained, while Princes declares 0.85g per 100g for its Tuna Chunks in Spring Water.

    Compare the current nutrition panels for the exact variants, using the same drained basis where both provide it.

  • Choosing a multipack without checking portions

    Tin size does not tell you how much drained tuna each person will get or how much salt a serving contributes.

    Check drained weight, servings per tin and salt per 100g before deciding how many tins to take.

  • Checking the tuna but overlooking the filling

    Mayonnaise, mustard and other sauces can add salt to a tuna sandwich or salad. NHS guidance identifies sauces as foods to watch when cutting down salt.

    Consider the whole filling when choosing condiments, rather than treating the tuna's figure as the figure for the finished meal.

  • Keeping opened tuna without following the label

    Instructions for unused tuna differ between products, including how soon it should be eaten after opening.

    Plan around the tin size. If tuna remains, follow that pack's instructions for transferring, refrigerating and using it.

Brands and product lines to compare

Sainsbury's

Its spring-water and brine tuna chunks offer a comparison between two specified own-label variants.

  • Sainsbury's declares 0.12g salt per 100g drained for Tuna Chunks in Spring Water 4x145g and 0.42g for its brine counterpart.
  • Check the current pack before buying; those figures should not be transferred to another size or variant.

Princes

Its Tuna Chunks in Spring Water is a 145g option for shoppers considering a single tin.

  • Princes declares 0.85g salt per 100g for this product.
  • Do not treat spring water in the product name as a reduced-salt declaration.

John West

Its No Drain Tuna Chunks in Spring Water MSC is intended for serving without a draining step.

  • The no-drain format may simplify opening and serving tuna outdoors.
  • John West declares 0.80g salt per 100g for this product and lists salt among its ingredients.

M&S

Its 160g Tuna Chunks in Spring Water offers another specified tin size; M&S describes this product as pole-and-line caught.

  • The stated sourcing method can be checked alongside the pack format.
  • M&S declares 0.75g salt per 100g for this product, so assess its salt separately from the sourcing claim.

Tesco

Tesco Groceries lists own-label tuna chunks in both brine and spring water.

  • The two packing styles give shoppers variants to compare.
  • Use the nutrition panel of the exact tin to judge its salt content; the packing style alone is not enough.

Joybuy tuna selection

This spring-water tuna chunks tin is an option to assess for picnic sandwiches, wraps or salads. Check its current salt declaration before choosing it for a reduced-salt meal.

Topical Sun Tuna Chunks in Springwater 160g tin

Topical Sun Tuna Chunks in Springwater 160g

Consider this 160g spring-water chunks tin for sandwiches, wraps or salads. If reducing salt is the deciding factor, check the current pack's salt per 100g and whether that figure refers to drained tuna before comparing it with another tin.

View on Joybuy

Questions about salt and picnic use

Does spring-water tuna always contain less salt?

No. The declared salt varies by exact product: Sainsbury's Tuna Chunks in Spring Water 4x145g lists 0.12g per 100g drained, while Princes Tuna Chunks in Spring Water lists 0.85g per 100g. Check the current tin rather than relying on the words “spring water”.

What does a low-salt figure mean on a food label?

The UK public label guide published by nidirect defines low salt as 0.3g or less per 100g and high salt as more than 1.5g per 100g. Compare figures on the same basis and check serving information too.

How should I handle tuna left after the picnic?

Follow the exact pack's instructions and refrigerate leftovers as directed. Sainsbury's instructs shoppers to transfer leftovers from its spring-water product to a non-metallic container and use them within one day; M&S gives a two-day instruction for its specified spring-water product.

Does the tuna's salt figure cover the whole sandwich?

No. The tuna's declaration covers the product on the stated label basis, not mayonnaise, sauces, bread or other ingredients added to a picnic sandwich. Check those ingredients separately if the finished meal's salt matters to you.

Is there separate tuna advice during pregnancy?

Yes. NHS guidance says people who are pregnant or trying for a baby should have no more than four cans of tuna a week or two tuna steaks a week because tuna can contain higher mercury levels than other fish. This is separate from comparing salt on tins.