http://skepdic.com/nessie.html
The Naturalist reported on extensive studies of the lake's ecology that indicate that the lake is capable of supporting no more than 30 metric tons of fish. (The food chain of the lake is driven by bacteria, which break down vegetation, rather than algae like most lakes.) Estimating that a group of predators would weigh no more than 10 percent of the total weight of the fish available for them to consume, researchers arrived at the 300-kg (660-lb.) statistic. It strikes me as extremely odd that with all the sophisticated technology, the submarines, and the thousands of voyeurs that after all these years we still don't have a single specimen. We don't have a carcass; we don't even have a bone to examine. With at least ten of these huge monsters swimming around in the lake at any given time, you'd think that there would be at least one unambiguous sighting by now. You would think so, that is, unless you want to keep the hoax/myth/legend alive. I can't deny that there are good economic reasons for keeping the Loch Ness monster myth alive. It's good for tourism. And there are all those "scientific" investigations to be paid for with government funds and private donations: full employment for cryptozoologists. Then, of course, there is all that film sold to photographers in search of The Big One. But tourism grew out of the myth, not the other way around. This story would be told with or without multi-media centers and gift shops full of Nessie mementos.
Besides the photo which Mr. Boyd and others have exposed as a fake, there are many other photos of Nessie to consider. Not all photos of Nessie are fakes. Some are genuine photos of the lake. These photos are always very gray and grainy, taken of murky waters with lots of shadows and outlines. There is no question that in some of these there does appear to be a form which could be taken for a sea serpent. The form could also be taken for a log, a shadow on a wave, a wave itself, driftwood, or flotsam. Anyone who has traveled around Loch Ness will not be disappointed in the variety of forms which one will see when looking out upon the waters. The lake is very long, and on the day I was there it was very turbulent, even though the day was a rather pleasant one as far as Scottish summer days go. Obviously, since I was there for only one day, I had not come to Loch Ness to do any serious research into the monster. I'll confess that I didn't even bother to stop in Drumnadrochit to take in the Loch Ness Monster Exhibit, which, according to Fodor's guide book to Scotland, "presents the facts and the fakes."
I was on vacation, traveling with my wife, daughter, future son-in-law, and a dear friend. We headed down the B862, which affords intermittent views of the lake from the east side. It was a pleasant drive among moors and conifer spikes, but nothing spectacular in a land of glorious spectacles. The drive northward on the west bank along the A82 takes you right along the lake in many places and past the famous Urquhart castle, a "favorite monster-watching spot" (Fodor's).
Urquhart is on the tourist bus trail and gets more than its share of visitors. I had wanted to stop there and take advantage of its excellent location for monster watching but I couldn't get into the parking lot. I drove north past the castle, looking for a place to turn around, and after many miles finally found one. I drove south, past the castle again, as the parking lot guard waved me on by the castle: the lot was still full. I drove for miles looking for a place to turn around again, finally found one, and made a third pass with the same result. Was it a sign from Nessie? We had to do most of our viewing of Loch Ness from the road. While we didn't see any monsters that day, I still have a vivid memory of one of Scotland's longest (24 miles) and deepest lakes (750, 800, or 900 ft. in places, depending on which source you pick). I have no doubt that anyone who stared across those murky, wavy, shadowy waters would see many things that could be Nessie. I don't doubt that many, if not most, of the thousands of witnesses who testify to having seen Nessie are honest, decent folk who have interpreted their perceptions according to their wishes. They have come to the lakeside and they have been blessed with a visitation! They are truly special and their lives are now marked forever as unique. Best of all: they have a story to tell for the rest of their lives. In many ways they are like the young lady who declared that the highlight of her life was when she saw music icon Michael Jackson being whisked through a department store: "it was like seeing a UFO," she declared! I'll bet she'll be telling the story of her Michael Jackson sighting for years to come. Who knows to what epic proportions the young lady's tale might grow? Perhaps it will grow as big as Loch Ness itself, like the legend of Nessie.