1. Laboratory of Freshwater Ecology Department of Ecology and Zoology Federal University of Santa Catarina (UFSC) Campus Universitário Reitor João David Ferreira Lima Florianópolis Santa Catarina 88040‐900 Brazil
2. Companhia Catarinense de Águas e Saneamento – CASAN Chapecó Santa Catarina 89814‐250 Brazil
3. Brazilian Agricultural Research Corporation ‐ Embrapa Swine and Poultry Concórdia Santa Catarina 89715‐899 Brazil