Striped Dolphin Welfare and Mediterranean Pressures

Striped dolphins in the Mediterranean Sea face overlapping threats from pollution, bycatch, noise disturbance, and disease, creating complex welfare challenges for this abundant but vulnerable species.

Key Facts

Striped dolphins are among the most abundant cetaceans in the Mediterranean, with estimated populations of 100,000+
They are highly social, living in groups of tens to hundreds of animals
Mediterranean striped dolphins carry among the highest polychlorinated biphenyl (PCB) burdens of any cetacean globally
High PCB levels cause immune suppression and have contributed to mass mortality events from morbillivirus
They are frequently bycaught in driftnets, longlines, and pelagic trawls in the Mediterranean
Underwater noise from shipping, seismic surveys, and military sonar disturbs striped dolphin behaviour
The Mediterranean population is classified as Vulnerable by the IUCN

Welfare Considerations

Striped dolphins in the Mediterranean experience chronic welfare insults from persistent organic pollutant accumulation, bycatch trauma and mortality, noise-induced behavioural disruption, and episodic mass mortality from disease. PCB body burdens impair reproductive success and immune function across generations. Bycatch victims suffer entanglement, drowning, and injury. Noise pollution disrupts echolocation, group cohesion, and foraging. Reducing pollutant inputs and bycatch mortality are the highest-priority welfare interventions.

What You Can Do

Support campaigns to reduce plastic and chemical pollution entering the Mediterranean Sea
Choose seafood caught with dolphin-friendly gear and from well-managed fisheries
Advocate for stronger enforcement of driftnet bans in the Mediterranean
Support Tethys Research Institute and other Mediterranean cetacean conservation organisations
Learn about how legacy pollutants like PCBs continue affecting marine mammals decades after regulation