1Laboratory of cyanobacteria and phycotoxins, Institute of oceanography, Federal university of rio grande, Rio grande, Brazil
2Aquaculture marine station (EMA), Institute of oceanography, Federal university of rio grande, Rio grande, Brazil
3Post graduate program in physical, Chemical and geological oceanography, Institute of oceanography, Federal university of rio grande, Rio grande, Brazil
4Post graduate program in aquaculture, Institute of oceanography, Federal university of rio grande, Rio grande, Brazil