Adriatic dolphins learn to hunt with trawlers as overfishing reshapes marine behaviour

Bottlenose dolphins in the Adriatic are increasingly following trawlers to scavenge for food, with baby dolphins learning the technique from their parents, according to a study cited by the Guardian on July 3rd. In one monitored area, researchers found that 76 percent of fishing boats were followed by dolphins, suggesting the behaviour has become widespread. Giovanni Bearzi, a co-author of the research, told the Guardian that "these days the easiest way to find bottlenose dolphins is to look for trawlers." The pattern represents a significant shift in how the region's dolphin population survives and reproduces.

The behaviour reflects the depletion of wild fish stocks in the Adriatic, one of Europe's most heavily exploited fishing grounds. Commercial trawling has reduced prey availability for marine predators, forcing dolphins to adapt by scavenging from nets and discards rather than hunting independently. The fact that calves are learning this behaviour from mothers suggests the practice is becoming institutionalised across generations, potentially locking dolphins into dependence on fishing activity even if stocks were to recover.

For Marche's fishing communities, the finding underscores the ecological cost of industrial trawling intensity. The Adriatic coast has long relied on fishing as a primary economic activity, but EU fisheries policy and declining catches have pressured the sector for decades. The Guardian's report does not specify which nations' trawlers the dolphins follow, but the Adriatic is shared by Italy, Croatia, Slovenia, Albania and Montenegro, with Italian and Croatian vessels operating across the basin.

The dolphins' shift to trawler-dependent feeding also creates a secondary problem: as fishing regulations tighten—driven by stock-depletion concerns—trawler activity may decline, potentially leaving dolphins without their newly essential food source. The behaviour observed by scientists represents an ecological trap: dolphins have adapted to an unsustainable situation, and that adaptation may not be reversible if commercial fishing is curtailed to allow fish populations to recover.

The study adds pressure to EU fisheries management to balance conservation with the livelihoods of fishing-dependent communities. Marche's ports, particularly Ancona, remain active in Adriatic fishing despite declining returns and stricter quotas. The dolphins' reliance on trawler discards is symptomatic of broader overfishing, a challenge that affects both marine wildlife and the human communities that depend on the sea. Policymakers face a choice between allowing continued high-intensity fishing to sustain both dolphins and fishing economies in their current depleted state, or enforcing stock recovery measures that may create short-term hardship for fishing families but restore the Adriatic ecosystem over time.