Uso da abordagem de modelos integrados para avaliar a dinâmica populacional do curimba Prochilodus lineatus (Valenciennes 1836) no alto rio Paraná, Brasil.

Abstract

Assessing fish stocks and quantify the influences of catches on population dynamics, has become a necessity in face of growing pressures that species have been suffering. Therefore, it is challenging to find analytical means to gain an understanding of populations and, among the various methods, we propose using integrated analyzes incorporating different sources of data to estimate population parameters of Prochilodus lineatus. For that, we used dependent and independent fishery data from the Itaipu reservoir and floodplain of the Upper Paraná River. The model lasted 24 years and showed that in some years the spawning biomass and recruitment are not enough to maintain the population, and the fishing and also the changes in the river level are the main causes of fluctuations in the abundance of the species. Besides, we also ponder the differences in selectivity between the two regions studied that basically is due to population stratification of the species that is divided between the regions. Finally, we propose that, despite considerable abundance that the species has in the region, continuous monitoring must be made in order to verify possible changes that may compromise the ecological and economic inventory levels so that mitigating actions can be undertaken in a timely manner.