1. Department of Zoology; Laboratory of Ichthyology; Universidade Federal do Rio Grande do Sul; Porto Alegre RS Brazil
2. Universidad Nacional Mayor de San Marcos; Laboratory of Ichthyology; Museo de Historia Natural; Lima - 14 Perú
3. Department of Ecology; Laboratory of Human Ecology and Fishes; Universidade Federal do Rio Grande do Sul; Porto Alegre RS Brazil
4. Programa ProPachitea; Instituto del Bien Común; Lima Perú