Yes, Loch Ness is home to a diverse "High-Fidelity" ecosystem of fish, which is often used as a scientific argument for why a large creature like the "Monster" could theoretically exist. The loch contains significant populations of Atlantic salmon, brown trout, and sea trout, which move through the waters to spawn. It also hosts the Arctic char, a beautiful "High-Fidelity" Ice Age relic that prefers the cold, deep waters of the Highlands. Other species include Northern pike, European eels, and three-spined sticklebacks. In 2026, high-fidelity eDNA (environmental DNA) surveys have confirmed that while the loch is nutrient-poor ("oligotrophic") and dark due to high peat content, it supports enough biomass for these resident fish. Some researchers have suggested that the "High-Fidelity" sightings of "Nessie" might actually be sightings of exceptionally large European eels, which are found in the loch in massive numbers, though none have been found that reach the prehistoric proportions of the local legend.