(Telecompaper) TIM Brasil has replaced its CEO Rodrigo Abreu with Stefano De Angelis after reporting first quarter net income down 59.7 percent to BRL 127.9 million compared to BRL 317.4 million a year earlier. Describing the first three months of the year as a "tough" quarter, the Brazilian operator also reported net revenues down 15.3 percent to BRL 3.85 billion compared to BRL 4.55 billion a year earlier, with a 14.3 percent rise in fixed failing to offset a 9.2 percent decline in mobile. EBITDA fell 16.6 percent to BRL 1.121 billion, affected by a number of factors, including Brazil's worst recession in decades, costs to reduce personnel and provisions for customers' unpaid accounts, which rose 26 percent year on year. However, ARPU was up 3 percent year on year, confirming the positive trend started in the previous quarter.