Ok. More on Lake Van, Turkey:
Situated at 1719 meters above sea level it receives a few short streams but has no outlet. That is why its waters are unusually rich in sodium
carbonate and other salts extracted by evaporation and used as detergents. Swimming in these brackish, "soda" waters, where the only surviving fish
is the herring, may result as an original experience, indeed.
Due to the annual inflow, higher than evaporation, the lake level continues to rise: several peninsulas have become islands during the 19th and 20th
centuries. In the 1986-1995 time period a dramatic 2.16 m rise in water level occurred.
There is little left from the original dense wood along its shores. The only remains of ancient woods are in a very small region on the southwestern
shore. The intensive pasture of huge Kurdish herds and deforestation for firewood erased even the memory.
So it is brackish salt with an abundance of herring. Plenty of food for a large squid population.
There is a reference page that says the Murat/Murad River flows from the lake, and then winds 75km to empty out into the Arabian Sea. Whether this it
the same river, I don't know yet. Still searching.
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Another interesting fact. On the video in the close-up shots of the creature, it's moving right to left. Just in front of the creature the water is
sort of bubbling. This may explain it.
Squid have more than one way to get around. One way is to cruise at slow speeds using the paired fins at the rear of the mantle, combined with
gentle, rhythmic pulses of water pushed out of the mantle cavity through the funnel. Squid expand the mantle cavity by contracting sets of muscles
within the mantle, water fills the expanded space, the muscles relax, and the elastic mantle then snaps back to a smaller size, jetting water out
through the funnel. The jet of water closes the flaps on either side of the squid's head so water can exit only through the funnel. This
rhythmic flow of water is also the way in which squid breathe. As water passes in and out, the gills are refreshed with oxygen.
[Edited on 11-11-2003 by darklanser]