On: Giant ‘Arrows’ Seen From Space Point to a Vanished...

[johngalt]

I want to say that there were fish traps that followed similar designs. Curving walls that led the fish into tidal pools that they couldn't escape when the tide went out.

[100pctremote → johngalt]

There are many of these ancient fish ponds throughout the Hawaiian islands -- some of them enormous and very pretty.

[205guy → 100pctremote]

I believe Hawaiian fish ponds were for pisciculture--raising fish. Saw a rock marked with a sign in a park, the Hawaiians used the hollowed out part to store fish while transporting between streams and ponds. They were not hunter-gatherers, they were (mostly) farmers.

[PeterWhittaker → johngalt]

Yes, weirs. See, e.g., https://en.wikipedia.org/wiki/Fishing_weir

[failrate → johngalt]

Yes, and some river traps work on a similar principle.

[michaelbuckbee → johngalt]

The audio's not great. But here's a fish trap using a similar concept to the traps in the article.

https://www.youtube.com/watch?v=yAB7KljY-9E

[troels → johngalt]

Exactly my thoughts. This is a giant fyke, but on land.