37 tons of dead fish removed from Rio Olympic rowing venueRIO DE JANEIRO (AP) — Fish continued to die by the ton Thursday in a Rio de Janeiro lake that’s slated to host Olympic rowing events, while city authorities and biologists argued about the cause of the die-off. Rio’s Comlurb waste management company said that as of Wednesday night, it had collected more than 37 tons of dead fish from the Rodrigo de Freitas lake since the die-off started late last week. Garbage collectors were out in force again on Thursday to rake dead fish off the water’s surface, and Comlurb said the effort would continue till the die-off subsides. The decomposing fish, a small silvery species called twaite shad, were trucked to the city’s main dump. But an overwhelming stench still enveloped the lake, sparking complaints by angry neighbors and passers-by Such die-offs are common in Rio, where rivers, lakes and even the ocean are blighted by raw sewage and garbage. In February, twaite shad died en masse in the blighted waters of the Guanabara Bay, where the Olympic sailing events are to be held. Rio’s environmental secretariat insisted Thursday that the latest incident is the result of a sudden change in water temperature. MORE