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llegal fishing has badly damaged the marine ecosystem off Menjangan Island in Buleleng regency, 100 kilometers northwest of Denpasar.

Emanuel Jarakana, a dive operator from Spoce Dive, said many local fishermen were still using cyanide bombs to catch fish, thus destroying coral reefs and underwater life in the waters of Menjangan and Tulamben in Karangasem regency.

"The bombs contain toxic chemicals that endanger the marine environment. They can kill millions of young fish and damage the precious coral reefs, which function as a balancing factor in the marine ecosystem," Jarakana said Wednesday during an event to commemorate Earth Day, at Lovina Beach, Buleleng regency.

Menjangan Island and Tulamben are well-known as Bali's top dive sites. Menjangan Island has eight beautiful dive sites, including Ranger Hut, Bat Cave, Underwater Cave, Ancor Wreck, Sand Slove, Underwater Buy, and Garden Ell.

For the past five years, a number of organizations and the local administration have been working hard to restore the marine ecosystem in Menjangan and Tulamben waters.

Both areas were devastated by illegal fishing and overexploitation of coral reefs. Projects were carried out to treat the damaged coral reefs and to educate local fishermen about safe fishing methods.

The results were astounding. Fish are returning, and the coral reefs are growing healthier. But in the past few months, dive operators have found coral reefs being damaged again because of the resumption of illegal fishing activities.

"We're collaborating with officials from Menjangan National Park and a local fishermen's group to guard the waters and find out who the perpetrators are," Jarakana said.