"Crocodile!" Célia Castro Pinheiro calls back to her husband as she steps into knee-deep water of the Rio Negro, a tea-colored river that begins in the Colombian mountains and flows into the Amazon below the Brazilian city of Manaus. Castro Pinheiro wades cautiously ahead, holding a machete high, worried less about carnivorous beasts and more about the condition of her fish trap, known as a fyke.
When she reaches the bag net structure, about 4 by 2 meters in size, she sees the wooden struts are broken and the net torn to shreds. This is bad news: Thousands of fish, several days' catch, have either escaped or been eaten by the crocodile.
