The colour of fish flesh is mainly determined by the type and number of pigments present in the muscle tissue. The two most common pigments found in fish flesh are myoglobin and astaxanthin, according to the best swordfish suppliers of the world.
· Myoglobin is a protein that is responsible for the red colour in fish flesh. Fish that are actively swimming and require more oxygen tend to have higher concentrations of myoglobin in their muscles, resulting in redder flesh. For example, tuna offered by fresh tuna suppliers contains a high myoglobin level which makes its flesh much redder than other types of fish.
· Astaxanthin is a carotenoid pigment that is responsible for the pink to orange-red colour of some fish, such as salmon, trout, and shrimp. Fish do not naturally produce astaxanthin but obtain it from their diet, such as from krill and other crustaceans. The amount of astaxanthin in a fish's diet can affect the colour of its flesh.
Other factors that can influence the colour of fish flesh include age, sex, and reproductive status. For example, male salmon tend to have more vibrant flesh colours than females, and fish that are nearing the end of their spawning period may have flesh that appears paler.
What does fish flesh look like when it is spoiled?
Spoiled fish flesh can have a variety of visual and olfactory cues that indicate that it is no longer safe to eat according to fish processing companies. Here are some common signs of spoiled fish flesh:
· Appearance: The flesh of spoiled fish may appear dull or faded in colour, or it may have a greyish or brownish tint. The flesh may also appear slimy, with a thick, opaque coating.
· Texture: The texture of spoiled fish flesh can also change. It may feel mushy or slimy to the touch, and it may fall apart easily.
· Smell: One of the most obvious signs of spoiled fish is a strong, unpleasant odour. Spoiled fish can smell fishy, sour, or ammonia-like.
· Taste: If you consume spoiled fish flesh, it may have a sharp, acidic taste or a bitter flavour. Eating spoiled fish can also cause stomach cramps, diarrhoea, and other symptoms of food poisoning.
It is important to note that even if the fish flesh looks and smells fine, it can still be unsafe to eat if it has been stored improperly or for too long. When in doubt, it is best to err on the side of caution and discard any fish that you suspect may be spoiled.