Sewage Untreated or improperly treated sewage promotes the growth of algae, which harms coral reefs. Some fishermen stun fish by squirting cyanide, a very toxic poison, into reef areas where fish seek refuge. The poison does not kill, but disorients the fish in the coral where they hide. The fisherman then rip apart the reefs with crowbars to capture the fish. In addition, cyanide kills coral polyps and the symbiotic algae and other small organisms necessary for healthy reefs.
Cyanide fishing is common in the South Pacific and Southeast Asia.
Blast Fishing Shock waves from blast fishing can destroy coral reefs. All rights reserved. The Evergreen Project, Inc.