<text>  The Mayor of Rio de Janeiro has admitted that the citys heavily polluted waterways will not be cleaned up in time for next years sailing events at the Olympic Games. While bidding to host the 2016 Olympics, the Brazilian city promised a massive clean-up of the Guanabara Bay, which is strewn with sewage and rubbish, so it could be used as a venue. But with less than 500 days to go before the opening ceremony, Rios mayor Eduardo Paes has said in an interview it is likely that conditions in the bay will not change before the Games. Scroll down for video . Polluted water flowing on to Barra beach in Rio de Janeiro. The citys mayor has admitted waterways in the Brazilian capital are unlikely to be cleaned up in time for the Olympics . Boats sit one the shore of Guanabara Bay in Rio de Janeiro among the rubbish and sewage, which is washed into the water . An artists impression of what it what was hoped the Guanabara Bay would have looked like in time for the sailing competitions . Mr Paes admitted that the clean up was something that they should have been able to achieve in time, adding: It is indeed a wasted opportunity. As a Rio resident, I think its a shame. As many of Rios shanty towns are without proper sewers or a reliable waste collection services, tons of rubbish and sewage flows into the bay as well as on to the citys world famous beaches. In the citys bid to host the 2016 Games, authorities promised a massive cleanup effort that would be an enduring legacy. A polluted waterway flows through the Rio das Pedras shanty town. These are often without proper sewers or a reliable waste collection services . Rios mayor Eduardo Paes has said in an interview it is likely that conditions in the bay will not change before the games . Environmental officials have long voiced their skepticism that the bay would be cleaned up on time for the sailing events . But environmental officials have long voiced their skepticism that the bay would be cleaned up on time. Athletes have also spoke out about the water condition in Guanabara Bay, with many worried about falling ill from the spray from the sewage or colliding with floating rubbish while competing. However, Olympic officials have continued to insist that the bay will be cleaned in time for the Games, with Mr Paes insisting the sailing events would take part in the cleanest area of the water. A boat trails an oil slick through the water in Guanabara Bay. Athletes have voiced their concerns about competing in the bay . But new pictures have shown household rubbish floating throught the entire bay, including in areas which will be used for the Olympic sailing competition. Heavy rain in Rio over the weekend exacerbated the problem as wet weather often sees trash and sewage flushed into waterways. The images also showed an oil slick trailing a boat in the water with Rios environmental agency saying they would levy a big fine against the vessels owners. 