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Dolphins Swap Natural Prey for Trawler Scraps
3 Jul
Summary
- Dolphins now follow fishing trawlers for food due to overfishing.
- Young dolphins learn this scavenging behavior from their parents.
- The Adriatic Sea's fishing pressure is double the sustainable level.
Bottlenose dolphins in the Adriatic Sea have developed a significant reliance on fishing trawlers, following them to scavenge for food due to depleted natural prey. Researchers observed that this behavior has intensified, with up to 76% of trawlers being followed in some areas, a stark increase from 10% in the 1990s. Young dolphins are learning these scavenging techniques from their mothers, indicating a cultural transmission of this survival strategy.
The Mediterranean Sea faces extreme fishing pressure, reportedly twice the sustainable level recommended by the FAO. This overfishing makes natural prey difficult for dolphins to find, forcing them to seek easier, though riskier, food sources in the wake of trawlers. The dolphins face potential dangers, including injury from fishing gear and hearing damage from chronic noise exposure.
This shift in foraging behavior is a critical indicator of the Adriatic's impoverished ecosystem, a situation exacerbated by the decline of other species like common dolphins. Scientists are urging for a reduction in destructive fishing practices to allow marine resources to recover and for dolphins to return to their natural feeding patterns. The call to action emphasizes fishing less and using more sustainable methods to protect marine biodiversity.
