Loch Ness: A Freshwater Lake

DNA can be captured, sequenced and then used to identify that creature by comparing the sequence obtained to large databases of known genetic sequences from hundreds of thousands of different organisms. Researchers took 250 samples of water taken around the lake, from the center of the lake and the very depths of the lake. They can't find any evidence of a creature that's remotely related to a Loch Ness monster or anything else within those sequence data samples. So no, the pleziosaur idea did not hold up based on the data that was obtained. One thing they did find was a good amount of eel DNA but other than that, you can basically rule it out.