Todd Moody wrote:

 >The point is that for a very long time any fish they caught would
 >have been from lakes and streams.

The second paragraph from the NY Time article I posted the link for is:

"At low tide, young and old alike rush out to the reef. Women hurriedly
gather up shellfish like conchs, clams and cowries, breaking open the
shells to extract the meat and so keep their burdens bearable. Men aim
bamboo spears tipped with iron to lance up snappers, sea perch, cod and
squid; or they toss out baited hand lines to yank in needlefish, perch,
tuna and mackerel. Boys and girls -- some of them barely old enough to walk
-- gather, spear and fish by hand with equal zeal."