What is the black stuff on salmon?

The black stuff on salmon is a parasitic sea lice. Sea lice are small, crustacean parasites that attach themselves to the skin of salmon and feed on their blood and mucus. They can cause significant damage to the fish, and can even lead to death. Sea lice are most common in the North Atlantic Ocean, but they have also been found in other parts of the world.

Sea lice are not only a problem for salmon, but they can also be a nuisance for humans. They can cause skin irritation and allergic reactions, and they can even transmit diseases to humans.

The presence of sea lice on salmon is a natural occurrence, and it does not necessarily mean that the fish is unsafe to eat. However, it is important to cook salmon thoroughly before eating it, as this will kill any sea lice that may be present.