Koi fish are technically edible since they are a type of carp, but they are generally not eaten because they are primarily ornamental fish. Their meat is often described as having a fishy or muddy taste, which many find unappealing. Koi are usually more valuable alive for their beauty and as pond pets than as food. Additionally, koi fish can carry parasites and are not bred for human consumption, which makes eating them less common and potentially unwise for frequent consumption. There are some cultural instances where koi fish are eaten, but this is rare and not typical in most places.
In summary, yes, it is possible to eat koi fish, but it is not common or recommended mainly due to taste, value as ornamental fish, and health concerns.
