QUOTE(Wolfox @ Jul 20 2007, 07:56 AM)

I'll just have to go for "my guess would be a giant eel." But, uhhh.... According to the documentary, eels don't grow upto a size like Nessie's size...
Seal? There's no such thing a fresh water seal...right? Lakes, which "loch" means in Scottish, are fresh water. But then the ocean following the loch closes that theory. Anyone else got fresh theories or old ones that are crucial to the Nessie sightings?
I know how some famous Nessie pic, like the Surgeon Photograph, were faked.
I am now tending to the giant eel theory. This has a certain quality to it. The Great Lakes in the US and Loch Ness have a few common characteristics, is about the only thing complicating the scenario, and both have had some "creature" sightings, though it's hard to tell if there are similarities in them from the varied and scattered accounts.
The thing about it being on land--there are actually relatively few reports of this, and it isn't sticking around when it is seen on land--it's moving for water. This would fit with the very limited eel contact with the surface or land.
As for size, there is more evidence for a giant eel--as with the giant squid--than you might think.
One source, Gardner Soule in _Mystery Monsters_ (NY: Putnam, 1965. 132-37. Chapter 12: "The Young Sea Serpent"), describes the catch by a young (at the time in 1930) scientist named Anton Bruun on contract for the Danish government, of a larval eel which would easily have grown to gigantic proportions--far larger than anything then or now actually known or proven to exist. The larvae reported by Bruun, was 6 feet long:
"Among eels, the conger and moray grow larger than others. A monster conger can grow up to 8 to 10 feet long. ...the record was about 11 feet long. The record moray...16 feet long
"The larvae of these eels are 3 to 4 inches long--or aobut one thirteenth (or so) of their length as adults.
"If the 6-foot larva grew proportionately to its size, the result would be an eel 180 FEET LONG [--my emphases--mcs]".
Bruun tried, over the years, but never caught another specimen, but extensive studies of the specimen determined beyond a doubt that it was merely a larva, not an adult.
This adult eel, if it's still around, is a WHOPPER.
When eels die, they go to the surface and "seethe and boil" as the waters of Loch Ness are repeatedly reported to do when the creature surfaces. They may appear as a series of humps.
Few reports of the Loch Ness monster--in terms of eyewitness reports--speak of heads or necks. Most--90%--talk about "humps" in the water.
An eel population in the world's oceans--Bruun's specimen was caught in the open sea off South Africa--of this size, could surely have inspired some sea serpent stories, anyway. Since Loch Ness, like the Great Lakes (though with more circuitous a connection for most of the Great Lakes), is connected through to the oceans on both sides, rather than being a landlocked lake, eels could circuit through occasionally.
It doesn't necessarily follow that the eels live in Loch Ness permanently, they could traverse it due to particular prey that attracts them.
The "dragon's head" photo of Rines, may actually be valid after all, is one possible spin-off of this theory. An eel this size, living in the depths for years, might develop encrustations on top of an already ugly-looking Moray eel head.
Others have posted some details about this eel theory on this thread already. Anyway, it's right now an especially intriguing theory.