Bomb Fishing Is Reducing Coral Reefs to ‘Rubble’

Bomb fishing is reducing coral reefs to rubble, according to new research revealing the extent of the damage caused by the illegal practice off the coast of Indonesia's Spermonde Archipelago. Researchers have recorded over 3,500 explosions in just 3,600 hours using underwater microphones, capturing the devastating impact of blast fishing on one of the world’s most biologically rich marine ecosystems, the Coral Triangle. The practice, known as blast fishing, involves packing plastic bottles with explosives and detonating them near coral reefs to stun and kill marine life. This method, which is globally banned, has been documented in at least 34 countries, ranging from Lebanon and Libya to Brazil and Ecuador. While primarily used to catch fish for local markets, the technique poses a severe threat to coral habitats. A single explosion can destroy up to 200 square feet of reef, transforming vibrant underwater landscapes into barren zones of rubble and dead coral. To study the issue, researchers from Britain and Indonesia deployed $150 audio recorders on the seafloor in Sulawesi, Indonesia, anchoring them to short stakes. They utilized AI software, developed and shared openly by the team, to analyze 16 months of audio recordings in just a few hours. Each potential detonation was manually verified to determine whether it originated from a bomb or a misfired boat engine. Sound travels approximately four times faster through water than air, allowing the team to detect explosions from distances exceeding 10 miles. According to the findings, the number of blasts detected exceeded 8,500 annually within an area of 350 square miles. With a bomb being detonated roughly every 62 minutes, the cumulative effect results in the destruction of three football fields of reef per year. This level of destruction contributes to the alarming decline of coral cover in the Spermonde Archipelago, where an estimated 75% of coral has been lost since 1990 due to human activities, bleaching, and rising ocean temperatures. Melissa Hampton-Smith, a postdoctoral researcher at James Cook University in Australia, explained that repeated blasts create unstable environments of rubble, hindering the ability of hard corals to settle and grow. This disruption makes natural reef recovery nearly impossible, exacerbating the long-term degradation of these vital ecosystems. The data also showed that blast fishing occurs year-round, with activity peaking in the mornings and declining significantly on Fridays, the local day of prayer. This pattern suggests a complex interplay of social and economic factors influencing the practice. Contrary to common assumptions attributing blast fishing solely to poverty and desperation, experts indicate that the practice is more commonly engaged in by middle-income fishermen. The high cost of acquiring necessary equipment such as boats, bombs, and detonators implies that the practice is driven by both economic necessity and the lack of effective regulation. Ineffective enforcement and poor management of fisheries remain key contributors to the persistence of blast fishing. As researchers continue to document the scale of the problem, they emphasize the urgent need for stronger regulatory measures and community-based conservation efforts to protect the fragile coral ecosystems of the Coral Triangle.