MADRID/MARSEILLE (AFP) - Tens of thousands of truckers in Spain, France and Portugal on Monday stepped up protests against rising fuel prices, causing mayhem on highways and blocking border crossings. Huge tailbacks built up around major cities and on the French-Spanish border as French fishermen in Mediterranean ports ended their three-week strike over the spiralling cost of fuel. Spain's second largest hauliers' union Fenadismer, which claims to represent 70,000 out of Spain's 380,000 truck drivers, launched an open-ended strike on Monday. It said it was "peaceful" but followed "massively". Talks Monday between the hauliers and the government ended in failure, Fenadismer said. "Fenadismer will maintain its national strike" as the government's proposals were "insufficient", it said. Trucks jammed several main highways including at the frontier with France, according to traffic officials, who also reported massive snarls in Madrid and Valencia. A Spanish truckers' group calling itself the Platform for the Defence of the Transport Sector, who say they speak for 50,000 truckers, walked off the job last week. They have threatened to disrupt the opening this weekend of the International Exposition in Zaragosa. The conservative Spanish newspaper ABC said the aim of the strikers was to block oil supplies from refineries and stocks at retail markets this week. Spanish media said the number of trucks at wholesale markets on Monday were considerably lower than usual. French truckers struggling with high fuel costs staged fresh protests near the Spanish border and in the southwest. Several trucks from the southern city of Perpignan disrupted traffic at border posts, preventing trucks from crossing and causing a tailback of some 10 kilometres (six miles) on both sides of the border. Private cars were allowed through. Protestors branded banners which read: "Trucker = Unemployed," and "It's the end of our profession." Some 200 trucks converged on the four main motorways leading into Bordeaux Monday morning, causing 30 kilometers (20 miles) of tailbacks in and around the city. "We are demanding immediate measures" to counter the impact of high fuel prices, said Jean-Pierre Morlin, president of the European trucking organisation for the Aquitaine region. Portuguese truckers Monday threatened to "paralyze" the country. According to police, trucks parked at petrol pumps were stoned overnight or while they were on the road after the strike started at midnight. Many had their windscreens shattered. The strikers also blocked entrances to several factories. According to industry figures, there are some 40,000 truckers in Portugal serving an estimated 5,000 firms. However, French fishermen from Mediterranean ports on Monday ended a three-week strike ahead of a key meeting of European fisheries ministers. "All of the fleets from the Mediterranean ports went back to work this morning, but we remain very vigilant," said Ange Natoli, a representative of the Mediterranean fishing fleets. Fleets in the Channel ports of Boulogne-sur-Mer, Calais and Dunkirk last week called off their strike pending the talks. Portuguese fishermen called off their five-day-old strike on Wednesday. However, their counterparts in Spain, home to Europe's largest fishing fleet, maintained their "indefinite" stoppage launched May 30. EU fisheries ministers meet on June 23-24 tackle the fuel crisis. Marine diesel prices have leapt by around 30 percent since the start of 2008, triggering protests in European ports as well as warnings that fishing boat owners face bankruptcy without higher subsidies. Meanwhile, French fishermen from Mediterranean ports on Monday ended a three-week strike as truckers in the southwest staged fresh protests against soaring fuel prices. "All of the fleets from the Mediterranean ports went back to work this morning, but we remain very vigilant," said Ange Natoli, a representative of the Mediterranean fishing fleets. French fishermen have suspended their protest ahead of a June 23-24 meeting of EU fisheries ministers that is to tackle the latest crisis in European fisheries over skyrocketing fuel prices. Fleets in France's biggest fishing port of Boulogne-sur-Mer, Calais and Dunkirk last week called off their strike pending the outcome of the talks in Brussels. French truckers struggling with high fuel costs staged fresh protests near the Spanish border and in the southwest, demanding government action to stem the price hike. About 15 trucks from the southern city of Perpignan disrupted traffic at several border posts and preventing trucks from crossing, causing a tailback of some 10 kilometres (six miles) on both sides of the border, an AFP journalist reported. Some 200 long-haul trucks were to converge on the four main motorways leading into Bordeaux early Monday, drive around the ring road before heading into the southwest city, said Jean-Pierre Morlin, president of the European trucking organisation for the Aquitaine region. "We are demanding immediate measures" to counter the impact of high fuel prices, said Morlin. The French truckers' action "is aimed at protesting the price of fuel and to make authorities aware of the need to harmonize the price of diesel in Europe," said Roland Bacou, head of a national trucking union for the Languedoc-Roussillon region. The protests were the latest in weeks of demonstrations first launched by French fishermen to call for government help to deal with soaring fuel costs caused by historically high oil prices. About 50 farmers ended their blockade of a national road after spending the night at the roadblocks, said the regional traffic information centre.