http://www.aboutseafood.com/health/omega2.html
> No.  For actual paleolithic people, brains and ALA were
> basically the only source.
yes i forgot about brains.

> The point is that for a very long time any fish they caught
> would have been from lakes and streams.  These fish are
> not a significant source of om-3.
at last you are not disputing the sharp-stick hypothesis, but otherwise your
research skills fit well with Cordain [ie non-existent].

are freshwater fish a source of omega 3s? why yes indeed...
http://www.aboutseafood.com/health/omega2.html

with sharp sticks ['spears'] men caught fish who swam in lakes, rivers, and
the sea [using 'boats'].  they also caught fish who live in the sea but then
swim upsteam to spawn['salmon;' 'sea trout'].  they also collected roe [you
seem to have forgotten this].  walking along the shores they collected
mussels, oysters, clams. they caught eels, which are very good sources of
omega 3s.  they also hunted seal, dugong, river porpoise.

omega 3s everywhere, and not a flax seed or olive in sight.

get the picture?
andrew