‘Holy Grail' Test for Illegal Cyanide-Caught Aquarium Fish May Be Fatally Flawed

A widely celebrated test believed to be able to determine if tropical marine aquarium fish were caught illegally using cyanide may be based on problematic data, a new study says.

Komang swerves to miss a pothole and then to avoid an oncoming bemo, the ubiquitous minibuses providing public transportation throughout Indonesia. He turns off the main road onto a sandy track. Large leaves slap against the truck’s rusted sides, as bags of reef fish slosh in the back. Ahead, through an insect-splattered windshield, chickens and children scuttle in a cacophony of squawks and laughter until the lushness gives way to a cobble beach with a fishing village huddled against dark hills in the distance. Komang pulls up near a small building. A man leans against an overturned dory surrounded by the detritus of his livelihood—nets, a boat beyond repair, a rusted engine block.

He leads Komang to a concrete pool filled

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