National Geographic : 1931 Jan
Photograph by Capt. A. W. Stevens THESE PENS ON THE BRAZILIAN COAST TRAP PISH WHEN THE TIDE RUNS OUT The rounded end at the left is always pointed out to sea. The open "Y" points toward the beach. Fish schools, running intoward shore tofeed athigh tide, are thus caught when the tide falls, carrying them into the open "Y." Men are seen working about thetrap.