"Cyanide fishing" refers to a harmful practice where fishermen use cyanide to stun and capture fish for the aquarium trade or consumption. It has a negative impact on coral reefs and marine life, making it a damaging method. Full definition
Aside from possible effects on human health, cyanide fishing inflicts damage on the coral reefs where it is employed, as the poison kills the reefs and many of the life - forms that rely on them (scientificamerican.com)
An agreement was concluded between the fishermen, defining the legal techniques of fishing, limited to certain authorized zones, with the purpose of putting an end to dynamite and cyanide fishing practices. (giliecotrust.com.cp-45.webhostbox.net)
Sadly, the most pristine reefs, far from the usual threats of sedimentation, coral mining and coastal development, are the primary target for cyanide fishing operations.» (scientificamerican.com)