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Why does tuna turn brown?

Asked: Richard Beland, Last Updated:

Fresh tuna, depending on its fat content, ranges in color from pale pink to deep red. (The more fat, the lighter the color.) Tuna tends to oxidize quickly, which cause it to turn an unappetizing grey or brown. ... The gas reacts with the myoglobin in the tuna, resulting in a stable pigment no matter how old the fish is.

FAQ

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    As far as food goes, shrimp are scavengers with relatively low demands compared to fish. In a community tank, no specific feeding may be needed, as the shrimp will consume uneaten fish food, algae, and biofilm. ... With the right housing and care, you will be able to breed your shrimp and will never have to buy any again!

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    Did the water change kill the fish? The answer is yes, but not because water changes are inherently bad. ... When a sudden, large water change occurs, it causes such a drastic shift in the makeup of the water that the fish often cannot tolerate it and they die.

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    Compared to other similar chains, Aldi actually scored pretty well, but there will still some issues. Its tuna fishing practices were subpar across the board, but its albacore fishing was especially problematic. ... Flavor-wise, Aldi's seafood is generally okay, but you should definitely steer clear of the frozen sushi.

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    While there are no reports of anyone getting sick from the shrimp, anyone who bought an affected bag should throw it away or return it for a refund. ... The FDA confirms it found salmonella in cooked shrimp from Kader Exports during a test.

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