The Pelagis ocean observatory has spotted a surge in dolphin deaths on the Atlantic coast, with 127 common dolphins washed up in January alone -- up from 73 in the same month last year.

Increased dolphin deaths are usually seen later in the year, during their February-March coastal feeding season that brings them closer to fishing vessels chasing hake and sea bass.

This year the increase in finds is "especially early", Pelagis said this month.

Over the whole of 2022, 669 dolphins washed up -- down from 1,299 in 2020.

Scientists believe that more than 80 percent of dead dolphins sink or decompose at sea rather than washing ashore, suggesting the real number of deaths is far higher at up to 11,000 per year.

Of the washed-up dolphins, "most presented signs of being caught in fishing equipment", Pelagis said, with the LPO singling out "slices in the tail fins and clear traces of nets" on their skin.

'Half-measures'

CIEM, a scientific body that tracks North Atlantic ecosystems, has for years urged a winter pause for some indiscriminate fishing techniques, meeting fierce resistance from industrial fishermen.

After two years of pressure from the European Commission and under the spotlight from activists, Paris has so far offered an eight-point plan with technical measures, stopping far short of an outright ban.

Measures include a voluntary observer scheme aboard fishing vessels, satellite tracking and fitting trawlers with cameras or acoustic repellent devices that drive the dolphins away.

Many fishing ships are already fitted with the devices in a "large-scale experiment" to test their effectiveness, the government said.

But the LPO denounced the government moves as "half-measures... that will change nothing and cost us precious time".

Environmentalist group Sea Shepherd said the repellent devices "create huge exclusion zones in dolphins' feeding grounds" that risk cutting them off from needed nourishment.

Paris has not completely closed the door to temporary bans, suggesting "time- and space-limited closures" to fishing could be tested in the Bay of Biscay in winter 2024-25 "if there are no satisfactory results in reducing accidental catches" of dolphins.

That isn't soon enough for the activists. Sea Shepherd have filed a criminal complaint on January 16 against persons unknown over the failure to intervene.